Article
Geosciences, Multidisciplinary
Hui Wang, H. Luehr, K. D. Zhang
Summary: This study investigates the longitudinal and seasonal variations of thermospheric superrotation at the magnetic equator, revealing different patterns during equinoxes and solstices. The interaction between the neutral wind and geomagnetic field plays a crucial role in superrotation, rather than F-region electron density. Lower atmospheric tides tend to suppress superrotation but contribute to longitudinal patterns.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Wangjie Yao, Xiaoqin Yan, Youmin Tang, Dejian Yang, Xiaoxiao Tan, Xunshu Song, Ting Liu
Summary: This study investigates the seasonal predictability of the Pacific-North American (PNA) teleconnection pattern during winter and its drivers using reanalysis and ensemble hindcasts data. The results indicate that ENSO is the main driver of the PNA pattern at the ends of the 20th century, and accurate prediction of the PNA-ENSO relationship leads to good seasonal forecasts of the PNA. However, during the middle of the 20th century, the PNA is not only influenced by ENSO but also closely linked to the Pacific Decadal Oscillation through air-sea coupling in the northern extratropical Pacific. Improving seasonal predictions of the PNA requires accurate prediction of both the PNA-ENSO relationship and the air-sea coupling in the region.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Yuanxin Liu, Lijing Cheng, Yuying Pan, John Abraham, Bin Zhang, Jiang Zhu, Junqiang Song
Summary: This study provides a comprehensive look at the seasonal variations of ocean salinity from regional to global scales, highlighting the importance of seasonal changes in surface precipitation and evaporation. The findings suggest that river runoff, sea ice change, and ocean dynamics play a significant role in controlling salinity changes in different regions and depths of the ocean. The study also points out the insufficiency of the Argo network in shallow oceans and polar regions, emphasizing the need for an integrated ocean observational network.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2022)
Article
Astronomy & Astrophysics
Majd Mayyasi, John Clarke, J. -Y. Chaufray, D. Kass, S. Bougher, D. Bhattacharyya, J. Deighan, S. Jain, N. Schneider, G. L. Villanueva, F. Montmessin, M. Benna, P. Mahaffy, B. Jakosky
Summary: The complex seasonal, dust, and atmospheric circulation patterns at Mars have significant impacts on the abundance and spatial extent of water and its byproduct H. Recent observations from the MAVEN mission show variations in H exobase temperatures, densities, thermal escape rates, and global escape rates, which are influenced by seasonal as well as solar cycle fluctuations. The results also indicate that H properties vary with solar cycle to a lesser extent than with seasons. However, it remains to be seen if a stronger solar cycle would have more pronounced effects on the upper atmospheric H properties.
Article
Meteorology & Atmospheric Sciences
Gloria L. Manney, Michaela I. Hegglin, Zachary D. Lawrence
Summary: The analysis reveals robust regional and seasonal variability in the relationship between upper tropospheric jet variability and El Nino-Southern Oscillation (ENSO). During El Nino, tropical jets associated with monsoons and the Walker circulation are weaker, while the zonal mean subtropical jet shifts equatorward in both hemispheres. Regional and seasonal variations are evident in both subtropical and polar jets, with significant changes in jet latitude, altitude, and wind speed during El Nino.
JOURNAL OF CLIMATE
(2021)
Article
Geosciences, Multidisciplinary
L. C. Hahn, K. C. Armour, D. S. Battisti, A. Donohoe, R. Fajber
Summary: Arctic warming is influenced by both winter CO2 peaks and summer forcing through seasonal ocean heat storage. Winter dry heat transport reduction is driven by Arctic sea-ice loss and warming, while summer moist heat transport increase is driven by sub-Arctic warming and moistening. Intermodel spread in Arctic warming controls the spread in seasonal poleward heat transport.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Meteorology & Atmospheric Sciences
Haijin Dai, Jun Zhao, Wenjing Zhao, Hong Huang, Yao Liu
Summary: Using reanalysis data and a numerical model, this study explores the evolution of diffusion in the upper ocean in different seasons and its contribution to seasonal heat storage (SHS) and Arctic amplification. The results show that vertical diffusion plays a dominant role in the formation and discharge of SHS. The loss of sea ice leads to land warming, which is mainly stored as SHS or warms the surface.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Engineering, Civil
Manjie Li, Zhaowei Liu, Qian Yu, Yongcan Chen
Summary: The study identified that environmental capacity, relative position, and anthropogenic activities were critical factors influencing water quality in the upper Yangtze River basin, with deteriorated water quality in the wet season attributed to increased anthropogenic practices and surface runoff. The spatio-seasonal variation patterns and research prospects proposed in the study could offer comprehensive insights and systematic supports for future works.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Chen Fang, Xiaogu Wang, Dong Sun, Hongchang Zhai, Dongsheng Zhang, Guanghong Liao, Chunsheng Wang
Summary: This study investigated the fish larvae in the Philippine Sea and found seasonal and latitudinal variations in their assemblage structure, providing important baseline data for fish development in this area.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Jutarak Luang-on, Joji Ishizaka, Anukul Buranapratheprat, Jitraporn Phaksopa, Joaquim I. Goes, Eligio de Raus Maure, Eko Siswanto, Yuanli Zhu, Qian Xu, Phattaranakorn Nakornsantiphap, Hiroshi Kobayashi, Satsuki Matsumura
Summary: In this study, the occurrence and characteristics of green Noctiluca blooms in the upper Gulf of Thailand were investigated using satellite data and a classification algorithm. The results showed that green Noctiluca blooms were frequent and displayed distinct spectral reflectance characteristics. The study also found that the frequency and distribution of green Noctiluca blooms varied with the Asian monsoon seasons. Comparisons with monsoon-induced factors provided an unprecedented overview of the spatial and temporal dynamics of red tides in the region.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Agronomy
Ruonan Chen, Liangyun Liu, Zhunqiao Liu, Xinjie Liu, Jongmin Kim, Hyun Seok Kim, Hojin Lee, Genghong Wu, Chenhui Guo, Lianhong Gu
Summary: Solar-induced chlorophyll fluorescence (SIF) has the potential to estimate gross primary production (GPP), but the quantitative relationship between them is not constant. In this study, a mechanistic model for SIF-based GPP estimation in evergreen needle forests (ENF) was developed, considering the seasonal variation in a key parameter of the model. The GPP estimates from this model were more accurate compared to other benchmark models, especially in extreme conditions.
AGRICULTURAL AND FOREST METEOROLOGY
(2024)
Article
Environmental Sciences
Sachin Dhawan, Mohan P. George, K. S. Jayachandran, Mukesh Khare
Summary: This study examines the contribution of various monitoring sites in Delhi to the O3 concentration. The highest O3 concentration is found in Green Areas, while the lowest is found in Industrial/Commercial Areas. Short-and long-range transport, downward draft, and biogenic emissions are the main factors contributing to O3 in Green Areas.
Article
Environmental Sciences
Markus Jesswein, Rafael P. Fernandez, Lucas Berna, Alfonso Saiz-Lopez, Jens-Uwe Grooss, Ryan Hossaini, Eric C. Apel, Rebecca S. Hornbrook, Elliot L. Atlas, Donald R. Blake, Stephen Montzka, Timo Keber, Tanja Schuck, Thomas Wagenhaeuser, Andreas Engel
Summary: This study investigates the global seasonal distribution of CH2Br2 and CHBr3 and finds that CH2Br2 shows pronounced seasonality in both hemispheres, while CHBr3 exhibits larger variability and less clear seasonality. The observations and model simulations show good agreement in the lowermost stratosphere, but there is a discrepancy in the southern hemispheric autumn. More extensive observations in the southern hemisphere are needed to fully understand the impact of these substances on lowermost-stratospheric ozone loss.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Geochemistry & Geophysics
D. A. Belyaev, A. A. Fedorova, A. Trokhimovskiy, J. Alday, O. Korablev, F. Montmessin, E. D. Starichenko, K. S. Olsen, A. S. Patrakeev
Summary: This paper reports the vertical profiling of carbon dioxide density and temperature in the upper Martian atmosphere using the Atmospheric Chemistry Suite (ACS) solar occultations onboard the ExoMars Trace Gas Orbiter. The study reveals the variability of different atmospheric layers and short-term fluctuations in the top layer related to dust activity.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Article
Environmental Sciences
Ting Feng, Fengwen Wang, Fumo Yang, Zhenliang Li, Peili Lu, Zhigang Guo
Summary: Analysis of atmospheric PM2.5 samples collected at an urban site in Chongqing University Campus revealed that major pollution sources included coal/biomass combustion, motor vehicle exhaust, diesel engine emissions, and natural biogenic sources. Winter and spring had the highest concentrations of organic carbon, PAHs, and n-alkanes, while autumn and winter had the highest concentrations of EC, char, and soot. The study also identified potential pollution sources in southeastern Sichuan and northwestern Chongqing through PSCF analysis.
Article
Environmental Sciences
Ignacio Pisso, Prabir Patra, Masayuki Takigawa, Toshinobu Machida, Hidekazu Matsueda, Yousuke Sawa
CARBON BALANCE AND MANAGEMENT
(2019)
Article
Environmental Sciences
Fenjuan Wang, Shamil Maksyutov, Aki Tsuruta, Rajesh Janardanan, Akihiko Ito, Motoki Sasakawa, Toshinobu Machida, Isamu Morino, Yukio Yoshida, Johannes W. Kaiser, Greet Janssens-Maenhout, Edward J. Dlugokencky, Ivan Mammarella, Jost Valentin Lavric, Tsuneo Matsunaga
Article
Environmental Sciences
Dmitry Belikov, Mikhail Arshinov, Boris Belan, Denis Davydov, Aleksandr Fofonov, Motoki Sasakawa, Toshinobu Machida
Article
Multidisciplinary Sciences
Taku Umezawa, Hidekazu Matsueda, Tomohiro Oda, Kaz Higuchi, Yousuke Sawa, Toshinobu Machida, Yosuke Niwa, Shamil Maksyutov
SCIENTIFIC REPORTS
(2020)
Article
Multidisciplinary Sciences
Xin Lin, Brendan M. Rogers, Colm Sweeney, Frederic Chevallier, Mikhail Arshinov, Edward Dlugokencky, Toshinobu Machida, Motoki Sasakawa, Pieter Tans, Gretchen Keppel-Aleks
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Multidisciplinary Sciences
Yasunori Tohjima, Prabir K. Patra, Yosuke Niwa, Hitoshi Mukai, Motoki Sasakawa, Toshinobu Machida
SCIENTIFIC REPORTS
(2020)
Review
Geosciences, Multidisciplinary
Marielle Saunois, Ann R. Stavert, Ben Poulter, Philippe Bousquet, Josep G. Canadell, Robert B. Jackson, Peter A. Raymond, Edward J. Dlugokencky, Sander Houweling, Prabir K. Patra, Philippe Ciais, Vivek K. Arora, David Bastviken, Peter Bergamaschi, Donald R. Blake, Gordon Brailsford, Lori Bruhwiler, Kimberly M. Carlson, Mark Carrol, Simona Castaldi, Naveen Chandra, Cyril Crevoisier, Patrick M. Crill, Kristofer Covey, Charles L. Curry, Giuseppe Etiope, Christian Frankenberg, Nicola Gedney, Michaela Hegglin, Lena Hoglund-Isaksson, Gustaf Hugelius, Misa Ishizawa, Akihiko Ito, Greet Janssens-Maenhout, Katherine M. Jensen, Fortunat Joos, Thomas Kleinen, Paul B. Krummel, Ray L. Langenfelds, Goulven G. Laruelle, Licheng Liu, Toshinobu Machida, Shamil Maksyutov, Kyle C. McDonald, Joe McNorton, Paul A. Miller, Joe R. Melton, Isamu Morino, Jurek Muller, Fabiola Murguia-Flores, Vaishali Naik, Yosuke Niwa, Sergio Noce, Simon O. Doherty, Robert J. Parker, Changhui Peng, Shushi Peng, Glen P. Peters, Catherine Prigent, Ronald Prinn, Michel Ramonet, Pierre Regnier, William J. Riley, Judith A. Rosentreter, Arjo Segers, Isobel J. Simpson, Hao Shi, Steven J. Smith, L. Paul Steele, Brett F. Thornton, Hanqin Tian, Yasunori Tohjima, Francesco N. Tubiello, Aki Tsuruta, Nicolas Viovy, Apostolos Voulgarakis, Thomas S. Weber, Michiel van Weele, Guido R. van der Werf, Ray F. Weiss, Doug Worthy, Debra Wunch, Yi Yin, Yukio Yoshida, Wenxin Zhang, Zhen Zhang, Yuanhong Zhao, Bo Zheng, Qing Zhu, Qiuan Zhu, Qianlai Zhuang
EARTH SYSTEM SCIENCE DATA
(2020)
Article
Geosciences, Multidisciplinary
Srabanti Ballav, Manish Naja, Prabir K. Patra, Toshinobu Machida, Hitoshi Mukai
JOURNAL OF EARTH SYSTEM SCIENCE
(2020)
Article
Meteorology & Atmospheric Sciences
Mai Ouchi, Yutaka Matsumi, Tomoki Nakayama, Kensaku Shimizu, Takehiko Sawada, Toshinobu Machida, Hidekazu Matsueda, Yousuke Sawa, Isamu Morino, Osamu Uchino, Tomoaki Tanaka, Ryoichi Imasu
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2019)
Article
Meteorology & Atmospheric Sciences
Hidekazu Matsueda, Rebecca R. Buchholz, Kentaro Ishijima, Helen M. Worden, Dorit Hammerling, Toshinobu Machida
Article
Environmental Sciences
Yasunori Tohjima, Hitoshi Mukai, Toshinobu Machida, Yu Hoshina, Shin-Ichiro Nakaoka
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2019)
Article
Environmental Sciences
Yoichi Inai, Ryo Fujita, Toshinobu Machida, Hidekazu Matsueda, Yousuke Sawa, Kazuhiro Tsuboi, Keiichi Katsumata, Shinji Morimoto, Shuji Aoki, Takakiyo Nakazawa
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2019)
Proceedings Paper
Oceanography
Vladimir V. Antonovich, Pavel N. Antokhin, Mikhail Yu. Arshinov, Boris D. Belan, Yury S. Balin, Denis K. Davydov, Georgy A. Ivlev, Artem V. Kozlov, Valery S. Kozlov, Grigory P. Kokhanenko, Mikhail M. Novoselov, Mikhail V. Panchenko, Ioganes E. Penner, Dmitry A. Pestunov, Denis E. Savkin, Denis V. Simonenkov, Gennady N. Tolmachev, Alexadr V. Fofonov, Dmitry G. Cherno, Vladimir P. Smargunov, Elena P. Yausheva, Jean-Daniel Paris, Gerard Ancellet, Kathy S. Law, Jacques Pelon, Toshinobu Machida, Motoki Sasakawa
24TH INTERNATIONAL SYMPOSIUM ON ATMOSPHERIC AND OCEAN OPTICS: ATMOSPHERIC PHYSICS
(2018)
Article
Environmental Sciences
Taku Umezawa, Hidekazu Matsueda, Yousuke Sawa, Yosuke Niwa, Toshinobu Machida, Lingxi Zhou
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2018)
Article
Environmental Sciences
James S. Wang, S. Randolph Kawa, G. James Collatz, Motoki Sasakawa, Luciana V. Gatti, Toshinobu Machida, Yuping Liu, Michael E. Manyin
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2018)