Article
Meteorology & Atmospheric Sciences
Jiangfeng Wei, Yimeng Liu, Haishan Chen
Summary: By conducting regional climate model experiments, it was found that atmospheric boundary layer (ABL) winds have an impact on intraseasonal climate variabilities in East Asia. The research revealed that climates became less similar in humid southern China but more similar in semiarid northern China/Mongolia (NCM) after ABL wind perturbations. The contrasting responses of local climate to ABL wind perturbations were mainly due to different land-atmosphere interactions in these two regions.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Meteorology & Atmospheric Sciences
J. I. N. G. Sun, K. U. N. Yang, Y. A. N. Yu, H. U. Lu, Y. A. N. L. U. A. N. Lin
Summary: The Tibetan Plateau has experienced increased warmth and precipitation over the past four decades, resulting in changes to the surface energy budget. This study investigates the atmospheric response to these changes using regional climate simulations. It is found that the weakened surface sensible heating reduces thermal effects, leading to decreased water vapor convergence and ultimately decreased precipitation. Furthermore, the frequency of light precipitation increases while heavy precipitation decreases. Overall, land-atmosphere interactions on the Tibetan Plateau have a negative feedback effect on the water cycle, partially offsetting the impacts of climate change.
JOURNAL OF CLIMATE
(2023)
Review
Agronomy
Manuel Helbig, Tobias Gerken, Eric R. Beamesderfer, Dennis D. Baldocchi, Tirtha Banerjee, Sebastien C. Biraud, William O. J. Brown, Nathaniel A. Brunsell, Elizabeth A. Burakowski, Sean P. Burns, Brian J. Butterworth, W. Stephen Chan, Kenneth J. Davis, Ankur R. Desai, Jose D. Fuentes, David Y. Hollinger, Natascha Kljun, Matthias Mauder, Kimberly A. Novick, John M. Perkins, David A. Rahn, Camilo Rey-Sanchez, Joseph A. Santanello, Russell L. Scott, Bijan Seyednasrollah, Paul C. Stoy, Ryan C. Sullivan, Jordi Vila-Guerau de Arellano, Sonia Wharton, Chuixiang Yi, Andrew D. Richardson
Summary: This review explores how continuous, automated observations of the atmospheric boundary layer can enhance the scientific value of co-located eddy covariance measurements of land-atmosphere fluxes, with four key opportunities highlighted for integrating tower-based flux measurements with continuous atmospheric boundary layer measurements.
AGRICULTURAL AND FOREST METEOROLOGY
(2021)
Article
Meteorology & Atmospheric Sciences
Federico Bianchi, Victoria A. Sinclair, Diego Aliaga, Qiaozhi Zha, Wiebke Scholz, Cheng Wu, Liine Heikkinen, Rob Modini, Eva Partoll, Fernando Velarde, Isabel Moreno, Yvette Gramlich, Wei Huang, Alkuin Maximilian Koenig, Markus Leiminger, Joonas Enroth, Otso Perakyla, Angela Marinoni, Chen Xuemeng, Luis Blacutt, Ricardo Forno, Rene Gutierrez, Patrick Ginot, Gaelle Uzu, Maria Cristina Facchini, Stefania Gilardoni, Martin Gysel-Beer, Runlong Cai, Tuukka Petaja, Matteo Rinaldi, Harald Saathoff, Karine Sellegri, Douglas Worsnop, Paulo Artaxo, Armin Hansel, Markku Kulmala, Alfred Wiedensohler, Paolo Laj, Radovan Krejci, Samara Carbone, Marcos Andrade, Claudia Mohr
Summary: This paper presents an introduction to the Southern Hemisphere High Altitude Experiment on Particle Nucleation and Growth (SALTENA). The research highlights from the campaign include the characterization of chemical species, the process of new particle formation, and the identification of long-range-transported compounds. The results underscore the importance of comprehensive observations in high-altitude locations in the undersampled Southern Hemisphere.
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2022)
Article
Geosciences, Multidisciplinary
Michael Barlage, Fei Chen, Roy Rasmussen, Zhe Zhang, Gonzalo Miguez-Macho
Summary: This study shows that a smaller grid spacing is needed to capture the impacts of groundwater processes on the water balance and hydrometeorology, and including groundwater processes in simulations can reduce temperature and precipitation biases and increase evapotranspiration.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Meteorology & Atmospheric Sciences
Yao Feng, Hong Wang, Wenbin Liu, Fubao Sun
Summary: Soil moisture has a significant impact on plant transpiration and photosynthesis, as well as on the land energy and water balance. This study examines global soil moisture-climate interactions during the peak growing season from 1982 to 2015. The results show positive interactions between soil moisture and precipitation, evapotranspiration, and negative interactions with temperature. The compounded effect of climate factors strengthens the soil moisture-climate interactions. Precipitation, evapotranspiration, and temperature are the main drivers of soil moisture variations in different regions. The study emphasizes the importance of considering climate factors and their interactions in understanding soil moisture dynamics and its response to climate extremes.
JOURNAL OF CLIMATE
(2023)
Article
Environmental Sciences
Yuanyuan Qin, Juanjuan Qin, Xiaobo Wang, Kang Xiao, Ting Qi, Yuwei Gao, Xueming Zhou, Shaoxuan Shi, Jingnan Li, Jingsi Gao, Ziyin Zhang, Jihua Tan, Yang Zhang, Rongzhi Chen
Summary: Knowledge of the chemical structures and optical properties of water-soluble organic carbon (WSOC) is critical for understanding its impact on aerosol-associated chemical reactions and climate radiative forcing. This study investigates the effects of pH and particle size on the chemical structure and optical properties of WSOC, as well as the aging process. The results show that WSOC in smaller particles has higher aromaticity and molecular weight, while WSOC in larger particles undergoes degradation during aging. Carboxylic groups are enriched in larger particles, while phenolic groups are more dominant in smaller particles. The fluorescence peak position suggests that hydroxyl groups play a leading role in pH-responsive fluorescence in summer, while carboxylic and nitro groups dominate in winter. Overall, smaller particles show a more pronounced pH dependence, which is related to the higher content of aromatic species in WSOC. The findings provide insights into the structure, source, and aging of WSOC, improving the accuracy of assessing its climate effects.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Meteorology & Atmospheric Sciences
Cenlin He, Olivia Clifton, Emmi Felker-Quinn, S. Ryan Fulgham, Julieta F. Juncosa Calahorrano, Danica Lombardozzi, Gemma Purser, Mj Riches, Rebecca Schwantes, Wenfu Tang, Benjamin Poulter, Allison L. Steiner
Summary: Understanding the interactions between air pollution and terrestrial ecosystems is crucial for predicting the impacts on climate and human health. Coordinated measurements, data standardization, and collaboration across disciplines and regions are key for advancing this understanding.
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2021)
Article
Environmental Sciences
Yanhong Zhu, Weijun Li, Yue Wang, Jian Zhang, Lei Liu, Liang Xu, Jingsha Xu, Jinhui Shi, Longyi Shao, Pingqing Fu, Daizhou Zhang, Zongbo Shi
Summary: Iron in aerosol particles plays an important role in marine ecosystems as a source of micronutrients, but it also poses potential threats to human health. A study conducted in Hangzhou, China, used receptor modeling to determine the sources of dissolved iron and total iron in different weather conditions. The results showed that industrial emissions were the main contributors to dissolved iron and total iron on haze, fog, dust, and clear days. The solubility of iron was highest on fog days and lowest on rain days.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Meteorology & Atmospheric Sciences
H. J. S. Fernando, I Gultepe, C. Dorman, E. Pardyjak, Q. Wang, S. W. Hoch, D. Richter, E. Creegan, S. Gabersek, T. Bullock, C. Hocut, R. Chang, D. Alappattu, R. Dimitrova, D. Flagg, A. Grachev, R. Krishnamurthy, D. K. Singh, I Lozovatsky, B. Nagare, A. Sharma, S. Wagh, C. Wainwright, M. Wroblewski, R. Yamaguchi, S. Bardoel, R. S. Coppersmith, N. Chisholm, E. Gonzalez, N. Gunawardena, O. Hyde, T. Morrison, A. Olson, A. Perelet, W. Perrie, S. Wang, B. Wauer
Summary: C-FOG is a comprehensive bi-national project focused on studying the formation, persistence, and dissipation of coastal fog. Through field observations and modeling, it integrates research across various processes, dynamics, microphysics, and thermodynamics to address the complexity of coastal fog. The project aims to identify and remedy numerical model deficiencies by utilizing a multiplatform framework for interpretation of field observations.
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2021)
Article
Meteorology & Atmospheric Sciences
Kai Yang, Chenghai Wang
Summary: By comparing the effects of snow cover anomalies and frozen soil thawing anomalies, this study investigates the impact of the frozen soil thawing anomalies on precipitation in early summer over the Tibetan Plateau. The results show that delayed (advanced) frozen soil thawing induces distinct cold (warm) anomalies in soil temperature, weakening (enhancing) surface diabatic heating over the mideastern Tibetan Plateau. Compared to the albedo effect of snow cover anomalies, the impacts of frozen soil thawing anomalies on soil hydrothermal regime and surface diabatic heating can persist longer.
JOURNAL OF HYDROMETEOROLOGY
(2023)
Article
Meteorology & Atmospheric Sciences
J. S. Reid, H. B. Maring, G. T. Narisma, S. van den Heever, L. Di Girolamo, R. Ferrare, P. Lawson, G. G. Mace, J. B. Simpas, S. Tanelli, L. Ziemba, B. van Diedenhoven, R. Bruintjes, A. Bucholtz, B. Cairns, M. O. Cambaliza, G. Chen, G. S. Diskin, J. H. Flynn, C. A. Hostetler, R. E. Holz, T. J. Lang, K. S. Schmidt, G. Smith, A. Sorooshian, E. J. Thompson, K. L. Thornhill, C. Trepte, J. Wang, S. Woods, S. Yoon, M. Alexandrov, S. Alvarez, C. G. Amiot, J. R. Bennett, M. Brooks, S. P. Burton, E. Cayanan, H. Chen, A. Collow, E. Crosbie, A. DaSilva, J. P. DiGangi, D. D. Flagg, S. W. Freeman, D. Fu, E. Fukada, M. R. A. Hilario, Y. Hong, S. M. Hristova-Veleva, R. Kuehn, R. S. Kowch, G. R. Leung, J. Loveridge, K. Meyer, R. M. Miller, M. J. Montes, J. N. Moum, A. Nenes, S. W. Nesbitt, M. Norgren, E. P. Nowottnick, R. M. Rauber, E. A. Reid, S. Rutledge, J. S. Schlosser, T. T. Sekiyama, M. A. Shook, G. A. Sokolowsky, S. A. Stamnes, T. Y. Tanaka, A. Wasilewski, P. Xian, Q. Xiao, Zhuocan Xu, J. Zavaleta
Summary: The NASA Cloud, Aerosol, and Monsoon Processes Philippines Experiment (CAMP2Ex) was conducted in the Philippines in 2019 to study the interaction of aerosol processes, cloud physics, and atmospheric radiation in the Maritime Continent's southwest monsoonal environment. It employed various aircraft, satellites, and surface sensors to characterize the complex atmospheric conditions. The experiment's preliminary results show the impact of increasing aerosol loadings on convection and the effectiveness of remote sensing sensors in quantifying aerosol and cloud properties.
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2023)
Article
Meteorology & Atmospheric Sciences
Olivia Martius, Kathrin Wehrli, Marco Rohrer
Summary: Model experiments show that soil moisture anomalies in Australia during the Southern Hemisphere summer can influence upper-level Rossby wave patterns, resulting in temperature anomalies and convective rainfall differences in the region, which in turn affect circulation patterns and storm tracks.
JOURNAL OF CLIMATE
(2021)
Article
Meteorology & Atmospheric Sciences
C. H. A. O. Zhang, X. I. A. O. J. I. N. G. Jia, A. N. M. I. N. Duan, D. U. E. Hu
Summary: The study investigates the interdecadal changes in the leading empirical orthogonal function (EOF) pattern of interannual variation in spring snow-cover extent (SCE) over the Tibetan Plateau (TP) (SSC_TP). It finds that during the period 1970-89, the leading EOF pattern transforms from an east-west dipole to a monopole structure, and the negative Antarctic Oscillation (AAO) plays a role in this transformation. In contrast, during the period 1991-2020, the Arctic Oscillation (AO) is associated with the monopole pattern. The mechanisms behind these changes are further analyzed.
JOURNAL OF CLIMATE
(2023)
Article
Meteorology & Atmospheric Sciences
Yijia Zhang, Zhicong Yin, Botao Zhou, Huijun Wang
Summary: This study found a close relationship between the warm Arctic-cold Eurasia (WACE) pattern in January and the weakened February haze pollution in North China. The warming signal in sea ice and the cooling signal in Eurasian soil temperatures contributed to the persistence of the WACE pattern from January to February. The combined signal of sea ice and soil temperature anomalies created an environment conducive to the dispersion of pollutants. The relationship between the WACE pattern and the cyclonic circulation anomaly could also be observed in the large-ensemble CMIP6 simulations. Furthermore, the relationship between the January WACE pattern and the reduction of February haze pollution has been prominently enhanced since the late 1990s, which corresponds to the deep Arctic warming that has emerged during that time.
JOURNAL OF CLIMATE
(2022)
Article
Engineering, Environmental
Mihnea Surdu, Houssni Lamkaddam, Dongyu S. Wang, David M. Bell, Mao Xiao, Chuan Ping Lee, Dandan Li, Lucia Caudillo, Guillaume Marie, Wiebke Scholz, Mingyi Wang, Brandon Lopez, Ana A. . Piedehierro, Farnoush Ataei, Rima Baalbaki, Barbara Bertozzi, Pia Bogert, Zoe Brasseur, Lubna Dada, Jonathan Duplissy, Henning Finkenzeller, Xu-Cheng He, Kristina Hohler, Kimmo Korhonen, Jordan E. Krechmer, Katrianne Lehtipalo, Naser G. A. . Mahfouz, Hanna E. Manninen, Ruby Marten, Dario Massabo, Roy Mauldin, Tuukka Petaja, Joschka Pfeifer, Maxim Philippov, Birte Rorup, Mario Simon, Jiali Shen, Nsikanabasi Silas Umo, Franziska Vogel, Stefan K. . Weber, Marcel Zauner-Wieczorek, Rainer Volkamer, Harald Saathoff, Ottmar Moehler, Jasper Kirkby, Douglas R. Worsnop, Markku Kulmala, Frank Stratmann, Armin Hansel, Joachim Curtius, Andre Welti, Matthieu Riva, Neil M. Donahue, Urs Baltensperger, Imad El Haddad
Summary: This study investigates the effect of high relative humidity (RH) on the gas-particle partitioning of biogenic oxidized organic molecules at low temperatures. The results demonstrate that high RH increases the partitioning of semivolatile compounds and leads to a shift in the chemical composition and volatility distribution of organic aerosols towards less oxygenated and more volatile species.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Henning Finkenzeller, Siddharth Iyer, Xu-Cheng He, Mario Simon, Theodore K. Koenig, Christopher F. Lee, Rashid Valiev, Victoria Hofbauer, Antonio Amorim, Rima Baalbaki, Andrea Baccarini, Lisa Beck, David M. Bell, Lucia Caudillo, Dexian Chen, Randall Chiu, Biwu Chu, Lubna Dada, Jonathan Duplissy, Martin Heinritzi, Deniz Kemppainen, Changhyuk Kim, Jordan Krechmer, Andreas Kurten, Alexandr Kvashnin, Houssni Lamkaddam, Chuan Ping Lee, Katrianne Lehtipalo, Zijun Li, Vladimir Makhmutov, Hanna E. Manninen, Guillaume Marie, Ruby Marten, Roy L. Mauldin, Bernhard Mentler, Tatjana Muller, Tuukka Petaja, Maxim Philippov, Ananth Ranjithkumar, Birte Rorup, Jiali Shen, Dominik Stolzenburg, Christian Tauber, Yee Jun Tham, Antonio Tome, Miguel Vazquez-Pufleau, Andrea C. Wagner, Dongyu S. Wang, Mingyi Wang, Yonghong Wang, Stefan K. Weber, Wei Nie, Yusheng Wu, Mao Xiao, Qing Ye, Marcel Zauner-Wieczorek, Armin Hansel, Urs Baltensperger, Jerome Brioude, Joachim Curtius, Neil M. Donahue, Imad El Haddad, Richard C. Flagan, Markku Kulmala, Jasper Kirkby, Mikko Sipila, Douglas R. Worsnop, Theo Kurten, Matti Rissanen, Rainer Volkamer
Summary: Iodine is an active trace element in atmospheric chemistry that can destroy ozone and form particles. Its emissions have increased threefold since 1950 and are expected to continue rising. In laboratory experiments, iodooxy hypoiodite (IOIO) was shown to efficiently convert into iodic acid (HIO3) via reactions IOIO + O-3 -> IOIO4 and IOIO4 + H2O -> HIO3 + HOI + O-(1)(2). This laboratory-derived mechanism explains field observations of daytime HIO3 in the remote lower free troposphere and suggests a catalytic role of iodine in aerosol formation.
Article
Engineering, Environmental
Penggang Zheng, Yi Chen, Zhe Wang, Yuliang Liu, Wei Pu, Chuan Yu, Men Xia, Yang Xu, Jia Guo, Yishuo Guo, Linhui Tian, Xiaohui Qiao, Dan Dan Huang, Chao Yan, Wei Nie, Douglas R. Worsnop, Shuncheng Lee, Tao Wang
Summary: This study conducted ambient measurements of OOMs at a regional background site in South China. It revealed that nitrogen-containing products were dominant, and different factors influenced the composition and oxidation state of OOMs. The results demonstrated the significant role of OOMs in sub-100 nm particle growth and SOA formation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Jani Leskinen, Anni Hartikainen, Sampsa Vaatainen, Mika Ihalainen, Aki Virkkula, Arunas Mesceriakovas, Petri Tiitta, Mirella Miettinen, Heikki Lamberg, Hendryk Czech, Pasi Yli-Pirila, Jarkko Tissari, Gert Jakobi, Ralf Zimmermann, Olli Sippula
Summary: In this study, the particle size dependency of the effective density (peff) was investigated for different types of particles from residential combustion and an aerosol standard burner. It was found that peff significantly increased due to photochemical aging, especially for larger soot agglomerates. The increase can be explained by the collapsing of chain-like agglomerates, filling of voids, and formation of secondary coating.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Mohamed L. Kassamba-Diaby, Corinne Galy-Lacaux, Veronique Yoboue, Jonathan E. Hickman, Camille Mouchel-Vallon, Kerneels Jaars, Sylvain Gnamien, Richmond Konan, Eric Gardrat, Siele Silue
Summary: In this study, precipitation samples were collected at one rural and two urban sites in Cote d'Ivoire, and the chemical composition and wet deposition fluxes were analyzed. Results showed that Ca2+ was the dominant ion in urban areas, while NH4+ was dominant in rural areas. The analysis of atmospheric sources revealed that urban areas were influenced by a mixture of terrigenous continental, anthropogenic, marine, and nitrogenous sources, while rural areas were mainly affected by marine, terrigenous, and nitrogenous sources. The evaluation of rain acidity showed that alkaline compounds were responsible for neutralizing a significant portion of the acidity.
Article
Meteorology & Atmospheric Sciences
Dimitri Castarede, Zoe Brasseur, Yusheng Wu, Zamin A. Kanji, Markus Hartmann, Lauri Ahonen, Merete Bilde, Markku Kulmala, Tuukka Petaja, Jan B. C. Pettersson, Berko Sierau, Olaf Stetzer, Frank Stratmann, Birgitta Svenningsson, Erik Swietlicki, Quynh Thu Nguyen, Jonathan Duplissy, Erik S. Thomson
Summary: The Portable Ice Nucleation Chamber 2 (PINCii) is a new continuous flow diffusion chamber (CFDC) that can measure ice nucleating particles (INPs). PINCii has been engineered to improve upon the limitations of previous CFDCs and offers several possibilities for improved INP measurements. It features low background particle counts, high-spatial-resolution wall-temperature mapping, and a new method for analyzing CFDC data. Additionally, it can be used to study droplet activation processes and extend ice crystal growth. The instrument's capabilities have been demonstrated through a series of experiments. The sources of uncertainty in CFDCs, including particle background, particle loss, and variations in aerosol lamina temperature and relative humidity, have also been quantified and discussed for PINCii. Overall, the importance of this work in developing a more advanced instrument for measuring INPs is rated 9 out of 10.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2023)
Article
Environmental Sciences
Yuyang Li, Jiewen Shen, Bin Zhao, Runlong Cai, Shuxiao Wang, Yang Gao, Manish Shrivastava, Da Gao, Jun Zheng, Markku Kulmala, Jingkun Jiang
Summary: Sulfuric acid (SA) is a major precursor for atmospheric new particle formation (NPF), and the formation of SA-dimethylamine (DMA) clusters initiates intense NPF events in polluted urban atmospheres. We developed a parameterization of SA-DMA nucleation based on cluster dynamic simulations and quantum chemistry calculations, which successfully reproduced the dependence of particle formation rates on temperature and condensation sinks (CSs). The parameterization was incorporated into a 3-D chemical transport model and showed good agreement with observations in wintertime Beijing, contributing significantly to nucleation rates and aerosol population during the simulations.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Lucia Caudillo, Mihnea Surdu, Brandon Lopez, Mingyi Wang, Markus Thoma, Steffen Brakling, Angela Buchholz, Mario Simon, Andrea C. Wagner, Tatjana Mueller, Manuel Granzin, Martin Heinritzi, Antonio Amorim, David M. Bell, Zoe Brasseur, Lubna Dada, Jonathan Duplissy, Henning Finkenzeller, Xu-Cheng He, Houssni Lamkaddam, Naser G. A. Mahfouz, Vladimir Makhmutov, Hanna E. Manninen, Guillaume Marie, Ruby Marten, Roy L. Mauldin, Bernhard Mentler, Antti Onnela, Tuukka Petaja, Joschka Pfeifer, Maxim Philippov, Ana A. Piedehierro, Birte Rorup, Wiebke Scholz, Jiali Shen, Dominik Stolzenburg, Christian Tauber, Ping Tian, Antonio Tome, Nsikanabasi Silas Umo, Dongyu S. Wang, Yonghong Wang, Stefan K. Weber, Andre Welti, Marcel Zauner-Wieczorek, Urs Baltensperger, Richard C. Flagan, Armin Hansel, Jasper Kirkby, Markku Kulmala, Katrianne Lehtipalo, Douglas R. Worsnop, Imad El Haddad, Neil M. Donahue, Alexander L. Vogel, Andreas Kuerten, Joachim Curtius
Summary: The complete chemical characterization of nanoparticles is challenging due to their abundance but negligible mass. This study compares different techniques for the chemical composition analysis of secondary organic aerosol nanoparticles. The experiments were conducted at the CLOUD chamber, and simultaneous measurements were performed using four different techniques. The results generally agree on the important compounds found in the nanoparticles, but each technique captures different parts of the organic spectrum, potentially due to factors such as thermal decomposition or sampling artifacts.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Meteorology & Atmospheric Sciences
Anton Rusanen, Kristo Horrak, Lauri R. Ahonen, Tuomo Nieminen, Pasi P. Aalto, Pasi Kolari, Markku Kulmala, Tuukka Petaja, Heikki Junninen
Summary: We introduce SMEARcore, a framework for real-time data analysis and management intended for measurement stations. It allows integration of new SMEAR stations with existing ones and facilitates easier problem diagnosis through robust data pipelines. Unlike previous similar concepts, SMEARcore keeps processing under data owners' control, provides tools for general data interoperability, and is extensible to new instruments. It is meant to supplement existing infrastructures and promote structured data curation in more measurement stations.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2023)
Article
Environmental Sciences
Daniel John Katz, Aroob Abdelhamid, Harald Stark, Manjula R. Canagaratna, Douglas R. Worsnop, Eleanor C. Browne
Summary: Measurements of ambient ion chemical composition provide direct insight into the most acidic and basic trace gases and their ion-molecule clusters. The use of the atmospheric pressure interface time-of-flight mass spectrometer (APi-ToF) combined with binPMF analysis allows for the temporal evolution of compounds important for new particle formation and growth to be studied. The results showed that negative ions consist of strong acids, organosulfates, and clusters derived from monoterpene and sesquiterpene oxidation, while positive ions consist of alkyl pyridines and amines.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Meri Raty, Larisa Sogacheva, Helmi-Marja Keskinen, Veli-Matti Kerminen, Tuomo Nieminen, Tuukka Petaja, Ekaterina Ezhova, Markku Kulmala
Summary: Boreal forests in the Northern Hemisphere have a complex interaction with the atmosphere, including a feedback process that may produce a cooling effect through increased cloud reflectance due to aerosol-cloud interactions. This study investigates the impact of the boreal forest environment on cloud-related properties during the growing season. Results show that air masses with longer exposure to the forest have different properties compared to those with shorter land transport times. The study also reveals changes in cloud condensation nuclei concentrations, specific humidity, and precipitation frequency after a certain threshold of land transport time.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Jian Zhao, Ella Hakkinen, Frans Graeffe, Jordan E. Krechmer, Manjula R. Canagaratna, Douglas R. Worsnop, Juha Kangasluoma, Mikael Ehn
Summary: Highly oxygenated organic molecules (HOMs) are crucial for the formation of secondary organic aerosol (SOA), but the lack of suitable analytical techniques has limited our understanding of particle-phase HOM speciation and its relationship with gas-phase HOM formation. This study used a novel VIA-NO3-CIMS system to investigate the gas- and particle-phase HOM products of a-pinene ozonolysis. The results showed that gas-phase dimer formation was suppressed with the addition of CO or NO, but particle-phase dimers still constituted a considerable fraction of the observed SOA. Overall, the VIA-NO3-CIMS system showed promise for combined online gas- and particle-phase HOM measurements.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Meteorology & Atmospheric Sciences
Jing Cai, Kaspar R. Daellenbach, Cheng Wu, Yan Zheng, Feixue Zheng, Wei Du, Sophie L. Haslett, Qi Chen, Markku Kulmala, Claudia Mohr
Summary: The offline application of FIGAERO-CIMS provides a cost-efficient method to analyze the molecular composition of organic aerosols. This study demonstrates the feasibility of using Teflon and quartz fiber filter samples collected in urban Beijing, with high signal-to-noise ratios, repeatability, and linear signal response. It expands the molecular characterization of organic aerosols by FIGAERO-CIMS to situations where the instrument itself cannot be deployed.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2023)
Article
Ecology
Matti Kamarainen, Juha-Pekka Tuovinen, Markku Kulmala, Ivan Mammarella, Juha Aalto, Henriikka Vekuri, Annalea Lohila, Anna Lintunen
Summary: In this study, machine learning methods (RF and GB) were used to predict the net ecosystem CO2 exchange (NEE) in a pine-dominated boreal forest in southern Finland over 1996-2018. The results showed that both RF and GB were able to explain the temporal variability of NEE using meteorological predictors, but GB was more accurate.
Article
Environmental Sciences
Lejish Vettikkat, Pasi Miettinen, Angela Buchholz, Pekka Rantala, Hao Yu, Simon Schallhart, Tuukka Petaja, Roger Seco, Elisa Mannisto, Markku Kulmala, Eeva-Stiina Tuittila, Alex B. Guenther, Siegfried Schobesberger
Summary: Wetlands cover a small portion of the land surface but boreal wetlands are experiencing significant warming and emit climate-relevant volatile organic compounds. This study presents the first-ever measurements of terpene emissions from a boreal fen wetland and found that isoprene was the dominant compound emitted. The emissions showed a strong exponential dependence on temperature and were significantly higher than previous estimates.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
