Article
Astronomy & Astrophysics
Guilherme Calabro-Souza, Andreas Lorke, Christian Noss, Philippe Dubois, Mohamed Saad, Celia Ramos-Sanchez, Brigitte Vincon-Leite, Regis Moilleron, Magali Jodeau, Bruno J. Lemaire
Summary: Solute exchange between sediment and water column has a strong impact on water quality in aquatic ecosystems. Existing techniques like aquatic eddy covariance (AEC) can only resolve the hourly dynamics of benthic fluxes for a few substances like oxygen. To overcome this limitation, relaxed eddy accumulation (REA) technique from micrometeorology was transferred to the sediment-water interface using a portable prototype instrumentation platform. The good agreement between REA and AEC fluxes indicates the reliability of the conditional sampling system, making REA a promising technique to study sediment contribution to biogeochemical cycles in aquatic ecosystems.
EARTH AND SPACE SCIENCE
(2023)
Article
Oceanography
Matthew H. Long
Summary: The study shows that waves in shallow waters can introduce biases in aquatic biogeochemical EC measurements, while larger measurement heights can create a spectral gap between turbulence and wave frequencies, reducing wave-bias. The new analysis framework and measurement guidelines can effectively remove wave-bias, but wave-bias still exists in traditional EC analysis results.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Agronomy
Kevin Boyko, Alexander G. Fernald, A. Salim Bawazir
Summary: Quantifying groundwater recharge from flood irrigated alfalfa fields in the Mesilla Valley, New Mexico using the soil water balance method and actual evapotranspiration measurements during the 2017 growing season showed that actual ET measurements improved recharge estimates in the alfalfa fields.
AGRICULTURAL WATER MANAGEMENT
(2021)
Article
Environmental Sciences
A. A. Renchon, J. E. Drake, C. A. Macdonald, D. Sihi, N. Hinko-Najera, M. G. Tjoelker, S. K. Arndt, N. J. Noh, E. Davidson, E. Pendall
Summary: Understanding the seasonal and diurnal dynamics of ecosystem respiration in forests is challenging due to the limitations in direct measurement methods. While soil respiration plays a significant role in seasonal variation, above-ground respiration may have a greater impact on the diurnal variation of ecosystem respiration. To improve the accuracy of ecosystem respiration measurements, it is essential to consider both above-ground and soil respiration processes.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Optics
David Yun, Ryan K. Cole, Nathan A. Malarich, Sean C. Coburn, Nazanin Hoghooghi, Jiwen Liu, Jacob J. France, Mark A. Hagenmaier, Kristin M. Rice, Jeffrey M. Donbar, Gregory B. Rieker
Summary: This study demonstrates the advantages of laser absorption spectroscopy with mode-locked frequency combs in accurately measuring mass flux across large open areas. The use of dual-frequency comb spectroscopy allows for simultaneous measurement of all components of mass flux with low uncertainty and spatial resolution.
Article
Engineering, Environmental
Benjamin C. Schulze, Ryan X. Ward, Eva Y. Pfannerstill, Qindan Zhu, Caleb Arata, Bryan Place, Clara Nussbaumer, Paul Wooldridge, Roy Woods, Anthony Bucholtz, Ronald C. Cohen, Allen H. Goldstein, Paul O. Wennberg, John H. Seinfeld
Summary: State inventories may underestimate methane emissions from dairy operations in California. Airborne flux measurements in the southern San Joaquin Valley show higher methane emissions from dairy farms compared to inventory estimates. This highlights the need for accurate emission inventories and further investigation of the meteorological factors influencing these emissions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Agronomy
Yazhen Jiang, Ronglin Tang, Zhao-Liang Li
Summary: This study proposes a physics-based full-factorial scheme for filling gaps in surface evapotranspiration (ET) observations, which outperforms four typical methods. The validation results show that the full-factorial scheme performs well for both hourly and daily gap-filling, with the best performance at grass sites and the worst performance at forest sites.
AGRICULTURAL AND FOREST METEOROLOGY
(2022)
Article
Chemistry, Multidisciplinary
Saquib Ahmed M. A. Peerzade, Nadezhda Makarova, Igor Sokolov
Summary: The mesoporous nature of silica nanoparticles allows for the development of ultrabright fluorescent particles by physically encapsulating organic molecular fluorescent dyes inside the pores. These particles can be used to assemble ultrabright fluorescent ratiometric sensors for simultaneous pH and temperature measurements with high sensitivity and stability.
Review
Geochemistry & Geophysics
Peter Berg, Markus Huettel, Ronnie N. Glud, Clare E. Reimers, Karl M. Attard
Summary: Aquatic eddy covariance (AEC) is a noninvasive technique with high temporal resolution and large area coverage, which provides new insights and more accurate assessments of the functioning and metabolism of aquatic ecosystems. The studies using AEC have revealed that benthic oxygen exchange is more dynamic than previously recognized, and accurate mean values can only be obtained by integrating measurements over all timescales. The technique has also seen new developments in measuring air-water gas exchange and long-term deployments.
ANNUAL REVIEW OF MARINE SCIENCE
(2022)
Article
Water Resources
Lucas Emilio B. Hoeltgebaum, Nelson Luis Dias, Marcelo Azevedo Costa
Summary: Practically all records of eddy-covariance flux measurements are affected by gaps, and this study proposes analog period methods for gap-filling, which outperform mean diurnal variation method and simple/multiple linear regression techniques. The proposed methods also perform better than REddyProc and evaporative fraction method for filling missing data.
HYDROLOGICAL PROCESSES
(2021)
Article
Geosciences, Multidisciplinary
Michael P. Vermeuel, Patricia A. Cleary, Ankur R. Desai, Timothy H. Bertram
Summary: The study reveals a significant contribution of nonstomatal pathways in canopy to the dry deposition of O-3, which is not correctly captured in current models. Stomatal uptake and estimated absorption only explain a small portion of O-3 loss.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Felix Witt, Javis Nwaboh, Henning Bohlius, Astrid Lampert, Volker Ebert
Summary: The proposed concept presents a calibration-free, first-principles, open-path dTDLAS hygrometer design with an uncertainty of below 4.5%. Static comparison between the new optics setup and a traceable dew point mirror hygrometer showed a systematic relative deviation of 2.6% with a maximal relative error of 2.2%, fulfilling the requirements of the proposed airborne EC hygrometer in terms of static precision and accuracy.
APPLIED SCIENCES-BASEL
(2021)
Article
Meteorology & Atmospheric Sciences
S. Guseva, F. Armani, A. R. Desai, N. L. Dias, T. Friborg, H. Iwata, J. Jansen, G. Luko, I Mammarella, I Repina, A. Rutgersson, T. Sachs, K. Scholz, U. Spank, V Stepanenko, P. Torma, T. Vesala, A. Lorke
Summary: In this study, the variability of the drag coefficient, Stanton number, and Dalton number in lakes and reservoirs of different sizes and depths was evaluated through direct measurements of surface fluxes. The results showed that these coefficients increase at low wind speeds due to the presence of gusts and capillary waves. At high wind speeds, the coefficients remain relatively constant. Therefore, it is recommended to consider the effects of gustiness and capillary waves on the drag coefficient and Stanton number, while the Dalton number can be assumed constant at all wind speeds.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Environmental Sciences
Fernando Paz, Ma Isabel Marin, Jaime Garatuza, Christopher Watts, Julio Cesar Rodriguez, Enrico A. Yepez, Antoine Libert, Martin Alejandro Bolanos
Summary: Efficient water management in agricultural crops is crucial for increasing productivity and adapting to climate change. This study focused on estimating evapotranspiration, measuring energy and matter flux using the eddy covariance technique, and describing footprints of net radiometer for estimating net radiation. The one-parameter model proposed in this study was validated in an experiment with satisfactory results, suggesting its potential use in estimating albedo and radiative temperature. The closure problem in energy balance could be solved by using a similar footprint as the aerodynamic components.
Article
Agronomy
Weijie Zhang, Martin Jung, Mirco Migliavacca, Rafael Poyatos, Diego G. Miralles, Tarek S. El-Madany, Marta Galvagno, Arnaud Carrara, Nicola Arriga, Andreas Ibrom, Ivan Mammarella, Dario Papale, Jamie R. Cleverly, Michael Liddell, Georg Wohlfahrt, Christian Markwitz, Matthias Mauder, Eugenie Paul -Limoges, Marius Schmidt, Sebastian Wolf, Christian Bruemmer, M. Altaf Arain, Silvano Fares, Tomomichi Kato, Jonas Ardo, Walter Oechel, Chad Hanson, Mika Korkiakoski, Sebastien Biraud, Rainer Steinbrecher, Dave Billesbach, Leonardo Montagnani, William Woodgate, Changliang Shao, Nuno Carvalhais, Markus Reichstein, Jacob A. Nelson
Summary: We evaluated the underestimation of latent heat flux (LE) associated with high relative humidity (RH) for different eddy covariance (EC) systems using the FLUXNET2015 dataset. We found that closed-path EC systems showed the most significant underestimation when RH was above 70%, and the extent of underestimation varied among sites. We proposed a machine learning-based method to correct this underestimation and compared it with two energy balance closure-based LE correction approaches. Our results highlight the importance of considering the high RH bias in water fluxes when estimating ecosystem T/ET and WUE.
AGRICULTURAL AND FOREST METEOROLOGY
(2023)
Article
Microbiology
Smruthi Karthikeyan, Luis M. Rodriguez-R, Patrick Heritier-Robbins, Janet K. Hatt, Markus Huettel, Joel E. Kostka, Konstantinos T. Konstantinidis
ENVIRONMENTAL MICROBIOLOGY
(2020)
Article
Engineering, Environmental
Smruthi Karthikeyan, Minjae Kim, Patrick Heritier-Robbins, Janet K. Hatt, Jim C. Spain, Will A. Overholt, Markus Huettel, Joel E. Kostka, Konstantinos T. Konstantinidis
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2020)
Article
Computer Science, Interdisciplinary Applications
C. H. Ainsworth, E. P. Chassignet, D. French-McCay, C. J. Beegle-Krause, I. Berenshtein, J. Englehardt, T. Fiddaman, H. Huang, M. Huettel, D. Justic, V. H. Kourafalou, Y. Liu, C. Mauritzen, S. Murawski, S. Morey, T. Ozgokmen, C. B. Paris, J. Ruzicka, S. Saul, J. Shepherd, S. Socolofsky, H. Solo Gabriele, T. Sutton, R. H. Weisberg, C. Wilson, L. Zheng, Y. Zheng
Summary: The Gulf of Mexico Research Initiative (GOMRI) has conducted in-depth studies on the 2010 Deepwater Horizon oil spill from various perspectives and recently assessed the program's accomplishments. By compiling 330 published applications and focusing on modeling efforts, GOMRI has made significant advancements in integrating diverse disciplines and domains. Various modeling tools have been utilized, with a focus on circulation models coupled with other environmental factors to track the fate of oil and its impact on ecosystems and human health.
ENVIRONMENTAL MODELLING & SOFTWARE
(2021)
Article
Ecology
Patrick Heritier-Robbins, Smruthi Karthikeyan, Janet K. Hatt, Minjae Kim, Markus Huettel, Joel E. Kostka, Konstantinos T. Konstantinidis, Luis M. Rodriguez-R
Summary: The study tested the specialization-disturbance hypothesis on beach sands disturbed by DWH crude oil in laboratory conditions, finding that functional diversity significantly increased while taxonomic diversity significantly declined over a two-month period, supporting the hypothesis that specialist taxa decrease following disturbances.
Review
Geochemistry & Geophysics
Peter Berg, Markus Huettel, Ronnie N. Glud, Clare E. Reimers, Karl M. Attard
Summary: Aquatic eddy covariance (AEC) is a noninvasive technique with high temporal resolution and large area coverage, which provides new insights and more accurate assessments of the functioning and metabolism of aquatic ecosystems. The studies using AEC have revealed that benthic oxygen exchange is more dynamic than previously recognized, and accurate mean values can only be obtained by integrating measurements over all timescales. The technique has also seen new developments in measuring air-water gas exchange and long-term deployments.
ANNUAL REVIEW OF MARINE SCIENCE
(2022)
Article
Environmental Sciences
Smruthi Karthikeyan, Janet K. Hatt, Minjae Kim, Jim C. Spain, Markus Huettel, Joel E. Kostka, Konstantinos T. Konstantinidis
Summary: Alkanes are commonly found in marine ecosystems, originating from natural oil seeps, human inputs, and biogenic production by cyanobacteria. A novel AlkB clade was discovered in the Gulf of Mexico, significantly increased in crude-oil impacted ecosystems, contrasting with traditional AlkB clades associated with cyanobacterial alkane biotransformation.
ENVIRONMENTAL MICROBIOLOGY REPORTS
(2021)
Article
Limnology
Emily J. Chua, Markus Huettel, Katja Fennel, Robinson W. Fulweiler
Summary: The marine nitrogen cycle is a major factor in ocean productivity and global climate, with recent research suggesting that permeable sandy sediments on continental shelves are key components. Despite decades of study, the role of shelf sediments in marine nitrogen cycling remains unclear and controversial, requiring further investigation to address unresolved issues.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2022)
Article
Marine & Freshwater Biology
Natalie L. Geyer, Dhruv Balwada, Elizabeth Simons, Kevin Speer, Markus Huettel
Summary: In shallow estuarine environments, physical processes may dominate the distribution of phytoplankton, but these processes and their dynamics are not well understood. Research shows that the small-scale flow environment can affect the shape and development of phytoplankton patches, with vertical shear broadening or dividing patches.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Biotechnology & Applied Microbiology
Markus Huettel
Summary: Oil contamination causes significant damage to beaches, affecting habitats, animal species, and coastal economies. The removal of oil from sandy beaches varies depending on climate conditions.
CURRENT OPINION IN CHEMICAL ENGINEERING
(2022)
Article
Biology
Yusuf C. El-Khaled, Nauras Daraghmeh, Arjen Tilstra, Florian Roth, Markus Huettel, Felix Rossbach, Edoardo Casoli, Anna Koester, Milan Beck, Raissa Meyer, Julia Plewka, Neele Schmidt, Lisa Winkelgrund, Benedikt Merk, Christian Wild
Summary: Comparative analyses have shown that fleshy red algae mats have high sessile invertebrate biodiversity, surpassing that of neighboring seagrass meadows. This suggests that these mats can serve as alternative habitats and temporary reservoirs for sessile invertebrates during times of environmental change.
COMMUNICATIONS BIOLOGY
(2022)
Article
Limnology
Kayleigh E. Granville, Peter Berg, Markus Huettel
Summary: This study evaluates a new optical submersible O-2 meter equipped with an ultra-high-speed optical fiber sensor for aquatic eddy covariance measurements. The meter, paired with an acoustic Doppler velocimeter, has a fast response time and can measure in both O-2-undersaturated and O-2-supersaturated water, recording high-quality, low-noise O-2 flux data.
LIMNOLOGY AND OCEANOGRAPHY-METHODS
(2023)
Article
Limnology
Peter Berg, Markus Huettel
Summary: In this study, it was found that tidal currents and intense sunlight were the main drivers of oxygen exchange in a sandy megaripple field. Daytime oxygen release and nighttime oxygen uptake were influenced by current-driven transport and rapid internal cycling. Additionally, seasonal differences in temperature and light affected the rates of primary production and respiration.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2023)
Article
Ecology
Alireza Merikhi, Peter Berg, Markus Huettel
Summary: The aquatic eddy covariance technique is a powerful method for benthic O2 flux measurements in shelf environments, and the newly introduced 3OEC instrument has demonstrated improved precision and lower error margin compared to conventional instruments. The 3OEC can provide more consistent flux measurements and eliminate uncertainties associated with time shift correction, offering novel insights into the mechanisms controlling fluxes in challenging environments.
Article
Oceanography
Kenneth M. Halanych, Cameron H. Ainsworth, Erik E. Cordes, Richard E. Dodge, Markus Huettel, Irving A. Mendelssohn, Steven A. Murawski, Claire B. Paris-Limouzy, Patrick T. Schwing, Richard F. Shaw, Tracey Sutton
Summary: The Gulf of Mexico ecosystems were significantly impacted by the Deep-water Horizon spill, with varying levels of damage across different environments. Deep-sea and mesopelagic environments showed less resilience, while some shallow ecosystems showed signs of recovery. Returning to pre-spill conditions is still uncertain.
Article
Ecology
Markus Huettel, Peter Berg, Alireza Merikhi