Article
Oceanography
Katherine D. Zaba, Peter J. S. Franks, Mark D. Ohman
Summary: In the California Current System, the Morro Bay filament is an important coastal upwelling feature characterized by enhanced cross-filament gradients, which have significant impacts on the cross-shore fluxes of physical, biological, and chemical tracers.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Geosciences, Multidisciplinary
Hui Ding, Michael A. Alexander, Michael G. Jacox
Summary: This study highlights the importance of considering ocean circulation in quantifying upwelling and its variability and change. The roles of Ekman and geostrophic transports in coastal upwelling change under global warming are investigated, with findings showing that neglecting geostrophic currents can lead to substantial inaccuracies in projections of coastal upwelling change in the California Current System.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Oceanography
K. O. Forsch, K. C. Fulton, M. M. Weiss, J. W. Krause, M. R. Stukel, K. A. Barbeau
Summary: This study investigates the biogeochemical connections between iron, macronutrients, and particles in coastal upwelling filaments. It found that the presence of iron influences the concentration of biogenic particles, such as diatoms, which in turn affects the ratios of surface macronutrient reservoirs and biogeochemical advective fluxes. This may lead to efficient carbon export downstream and offshore of the region with the highest phytoplankton growth rates and productivity.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
Megan A. Cimino, Scott A. Shaffer, Heather Welch, Jarrod A. Santora, Pete Warzybok, Jaime Jahncke, Isaac Schroeder, Elliott L. Hazen, Steven J. Bograd
Summary: With the increasing climate change, novel approaches are needed to monitor and manage ecosystem changes. This study explores the feasibility of using western gulls as indicator species for the state of marine ecosystems and investigates the interannual variability in gull foraging behavior. The results show that gull foraging behavior is related to upwelling conditions, prey abundances, and overlap with humpback whales. To better protect the threatened eastern Pacific humpback whale population, the deployment of gull tags with real-time data accessibility is needed.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Oceanography
Shailja Gangrade, Peter J. S. Franks
Summary: Locally enhanced productivity and carbon export are observed at oceanic density fronts, and the physical-biological interplay along and across these fronts is often assumed or hypothesized. However, the short residence times of waters in fronts challenge this assumption. This study explores an eddy-associated front in the California Current System, finding distinct origins of phytoplankton patches along the front, related to strong upstream coastal upwelling pulses.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Engineering, Environmental
Chunlu Jiang, Ming Li, Chang Li, Wendi Huang, Liugen Zheng
Summary: This study used hydrochemical and carbon isotope methods to explore the sources and factors influencing dissolved inorganic carbon (DIC) in groundwater in different active areas in coal mining areas. The results showed that soil CO2 and carbonate rock weathering were the major sources of DIC in groundwater. This study provides a theoretical reference for water resource management and helps clarify the sources and circulation of DIC in groundwater under the influence of anthropogenic activities.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2023)
Article
Agronomy
Wenjie Xiao, Yan Yang, Xiuyang Jiang, Zhili He, Xiaogang Zou, Xianhui You, Yunyue Yang, Zhuzhou Zeng, Wei-Yu Shi
Summary: The study found that different vegetation restoration schemes and treatment measures should be implemented between the dip and anti-dip slopes in the rocky desertification areas of Ganxi Town. The protection of soil and water resources, especially soil, is crucial for ecological restoration.
Article
Environmental Sciences
Dang An Tran, Maki Tsujimura, Hai Pham, Tam Nguyen, Loc Huu Ho, Phu Le Vo, Khai Quang Ha, Thanh Duc Dang, Doan Van Binh, Quang-Van Doan
Summary: This study investigates the impacts of groundwater pumping practices and regional groundwater flow dynamics on groundwater flow and salinity intrusion in the coastal aquifers of the Vietnamese Mekong Delta. The modeling results revealed that groundwater pumping activities and variation of regional groundwater flow systems strongly influence groundwater level depletion and saline movement. High salinity levels are expected to expand downward in the next 14 years under increasing groundwater pumping capacity.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Civil
Samia Saad, Akbar A. Javadi, Hany F. Abd-Elhamid, Raziyeh Farmani
Summary: Seawater intrusion is a natural phenomenon that negatively affects groundwater potability and is expected to worsen with rising sea levels due to climate change. This study proposes a novel mitigation measure called Inj-GCW, which combines the injection of reclaimed water with the use of groundwater circulation wells (GCW) to enhance the effectiveness of artificial recharge in controlling seawater intrusion. The proposed measure was evaluated using a simplified unconfined coastal aquifer, and it was found to effectively retreat the saltwater wedge and reduce aquifer salinity.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Adelaide V. V. Dedden, Catherine M. M. Kemper, Gary Truong, Matthew R. R. McCurry, Paul D. D. van Ruth, Tracey L. L. Rogers
Summary: This study utilized stable isotopes to infer the diet and habitat use of pygmy right whales. The results showed that these whales inhabit mid-latitude waters year-round and feed on krill and copepods between coastal waters off southern Australia and the Subtropical Convergence. Additionally, their diet may be correlated with changes in sea surface temperature in certain regions. This study provides important contributions to our understanding of pygmy right whales.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Engineering, Civil
Yao Lu, Yang Gao, Jennifer A. J. Dungait, Junjie Jia, Kun Sun, Shuoyue Wang, Yafeng Wang, Zhaoxi Li
Summary: Salinity, area, and altitude are the main environmental gradients influencing lake water and carbon sources on the Qinghai-Tibet Plateau. Evaporation plays a significant role in controlling the chemical characteristics of lake systems. Glacial meltwater, rainwater, soil water, and evaporation are key factors influencing lake water on the plateau. Atmospheric exchange, soil organic matter, and rock weathering are major sources of dissolved inorganic carbon in lake water. Salinity and altitude, particularly salinity, are the main influencing factors on lake water and carbon sources in the plateau region.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Heng Zhang, Zhongfa Zhou, Hui Dong, Lihui Yan, Shengjun Ding, Jing Huang, Xiaohuan Gong, Dan Su
Summary: By studying the hydrogeochemical characteristics and isotopic composition of dripwater in a cave in southwest China, it was found that the δC-13(DIC), Mg/Ca, and Sr/Ca values of the dripwater showed significant seasonal variations, indicating the influence of water-gas-rock reactions such as soil CO2 concentrations and carbonate rock dissolution. The fast and slow seepage of dripwater in the cave reflected the varying effects of precipitation, and the δC-13(DIC) was more sensitive to changes in recharge from extreme precipitation and drought events, making it a reliable indicator of hydrological signals in the southwest monsoon region.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Hend S. Abu Salem, Khaled S. Gemail, Natalia Junakova, Amin Ibrahim, Ahmed M. Nosair
Summary: Understanding the hydrogeochemical processes and flow patterns in the mixing freshwater/saltwater zone is crucial for managing freshwater in worldwide coastal aquifers. This study focuses on investigating the seawater intrusion in the Egyptian Nile Delta aquifer through a multidisciplinary approach involving hydrogeochemical, statistical analysis, and DC resistivity measurements. The results show the status of the seawater intrusion and provide insights into the compositional thresholds of certain ions, indicating wells affected by the intrusion. The study also demonstrates the effectiveness of combining hydrogeochemical facies and resistivity investigations for large-scale characterization and management of coastal groundwater.
Article
Meteorology & Atmospheric Sciences
Faycal Kessouri, Karen McLaughlin, Martha Sutula, Daniele Bianchi, Minna Ho, James C. McWilliams, Lionel Renault, Jeroen Molemaker, Curtis Deutsch, Anita Leinweber
Summary: The study presents a realistic ocean model to investigate coastal eutrophication issues in the Southern California Bight. Through evaluation against a broad suite of observational data, the model simulation effectively captures the state and variability of the region.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2021)
Article
Engineering, Civil
Yao Lu, Yang Gao, Junjie Jia, Shaxia Xia, Xuefa Wen, Xiubo Yu, Kun Shi, Zhaoxi Li, Shuoyue Wang
Summary: This study focused on Poyang Lake, which has rapid water renewal and high river-lake connectivity, leading to a large amount of dissolved inorganic carbon that cannot be deposited into sediment. The main sources of dissolved inorganic carbon in Poyang Lake are atmospheric deposition, carbonate weathering, and silicate weathering. The coupling characteristics of carbon and water in the Poyang Lake Basin continuously change under such conditions.
JOURNAL OF HYDROLOGY
(2021)
Article
Geography, Physical
Laura E. Beramendi-Orosco, Kathleen R. Johnson, Alexandra L. Noronha, Galia Gonzalez-Hernandez, Jose Villanueva-Diaz
QUATERNARY GEOCHRONOLOGY
(2018)
Article
Geochemistry & Geophysics
Peter E. Carlson, Jay L. Banner, Kathleen R. Johnson, Richard C. Casteel, Daniel O. Breecker
GEOCHIMICA ET COSMOCHIMICA ACTA
(2019)
Article
Geochemistry & Geophysics
Jessica K. Wang, Kathleen R. Johnson, Andrea Borsato, Dillon J. Amaya, Michael L. Griffiths, Gideon M. Henderson, Silvia Frisia, Andrew Mason
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Geography, Physical
S. M. Aarons, L. J. Arvin, S. M. Aciego, C. S. Riebe, K. R. Johnson, M. A. Blakowski, J. M. Koornneef, S. C. Hart, M. E. Barnes, N. Dove, J. K. Botthoff, M. Maltz, E. L. Aronson
Article
Meteorology & Atmospheric Sciences
Jessica K. Wang, Jin-Yi Yu, Kathleen R. Johnson
Article
Multidisciplinary Sciences
Michael L. Griffiths, Kathleen R. Johnson, Francesco S. R. Pausata, Joyce C. White, Gideon M. Henderson, Christopher T. Wood, Hongying Yang, Vasile Ersek, Cyler Conrad, Natasha Sekhon
NATURE COMMUNICATIONS
(2020)
Article
Multidisciplinary Sciences
Annabel Wolf, William H. G. Roberts, Vasile Ersek, Kathleen R. Johnson, Michael L. Griffiths
SCIENTIFIC REPORTS
(2020)
Article
Forestry
Genaro Gutierrez-Garcia, Laura E. Beramendi-Orosco, Kathleen R. Johnson
Article
Geosciences, Multidisciplinary
Kathleen R. Johnson
Summary: Climate change is expected to decrease mean precipitation in California, but changes in hydroclimate extremes are likely to have more immediate and significant impacts. The study provides a new approach for developing more robust and quantitative hydroclimate records, and highlights the need to prepare for precipitation whiplash as a ubiquitous feature of California's climate.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Kevin T. Wright, Kathleen R. Johnson, Tripti Bhattacharya, Gabriela Serrato Marks, David McGee, Dillon Elsbury, Yannick Peings, Jean-Louis Lacaille-Muzquiz, Gianna Lum, Laura Beramendi-Orosco, Gudrun Magnusdottir
Summary: Reconstructing hydroclimate over the Common Era is important for understanding precipitation change mechanisms. The study found that mean annual rainfall in Northeast Mexico is highly sensitive to Atlantic sea-surface temperature variability, suggesting future precipitation will be more dependent on the warming of Tropical Atlantic than the Tropical Pacific.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Kevin T. Wright, Kathleen R. Johnson, Gabriela Serrato Marks, David McGee, Tripti Bhattacharya, Gregory R. Goldsmith, Clay R. Tabor, Jean-Louis Lacaille-Muzquiz, Gianna Lum, Laura Beramendi-Orosco
Summary: A stalagmite record from Tamaulipas, Mexico reveals that Atlantic and Pacific temperatures affect precipitation changes, and dry conditions occurred during Heinrich Stadials due to southward moisture shift. However, the timing and mechanisms of past hydroclimate change in northeast Mexico are poorly understood, which hampers the evaluation of climate model performance.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Elizabeth W. Patterson, Kathleen R. Johnson, Michael L. Griffiths, Christopher W. Kinsley, David McGee, Xiaojing Du, Tamara Pico, Annabel Wolf, Vasile Ersek, Richard A. Mortlock, Kweku A. Yamoah, Thanh N. Bui, Mui X. Tran, Do-Trong Quoc, Tri V. Vo
Summary: This study presents a stalagmite record from central Vietnam that provides evidence for a prolonged dry period during the last glacial maximum, followed by a sudden shift to wetter conditions during deglaciation. Sea-level change is found to drive autumn monsoon rainfall variability on glacial-orbital timescales and modulates the magnitude of millennial-scale dry and wet phases. This mechanism highlights the importance of sea level in the variability of autumn monsoon in Southeast Asia.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Multidisciplinary Sciences
Annabel Wolf, Vasile Ersek, Tobias Braun, Amanda D. French, David Mcgee, Stefano M. Bernasconi, Vanessa Skiba, Michael L. Griffiths, Kathleen R. Johnson, Jens Fohlmeister, Sebastian F. M. Breitenbach, Francesco S. R. Pausata, Clay R. Tabor, Jack Longman, William H. G. Roberts, Deepak Chandan, W. Richard Peltier, Ulrich Salzmann, Deborah Limbert, Hong Quan Trinh, Anh Duc Trinh
Summary: The winter and summer monsoons in Southeast Asia are important sources of rainfall, but their variability is not well understood. Conflicting proxy observations have limited our understanding of the winter monsoon. However, a speleothem record from Southeast Asia has revealed that winter and summer rainfall changed simultaneously, driven by changes in the Pacific and Indian Oceans.
NATURE COMMUNICATIONS
(2023)
Article
Environmental Sciences
Mengyu Wang, Chaoyong Hu, Yuhui Liu, Lianlian Li, Shucheng Xie, Kathleen Johnson
Summary: By studying precipitation variability in East China over the past 1150 years, it was found that the strength of the Asian monsoon is closely linked to solar variability, while rainfall patterns are driven by the Pacific Decadal Oscillation and Atlantic Multidecadal Oscillation.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Geochemistry & Geophysics
Joshua M. Feinberg, Kathleen R. Johnson
Summary: Caves exhibit diverse morphologies that provide clues to their formation mechanisms, while their iconic mineral features carry rich paleoenvironmental information. Recent studies have shown significant advancements in the ability to decode these paleoenvironmental proxies, as well as dramatic progress in extending high-resolution records further back in geological time. Cave research is addressing an increasing range of geoscience problems, from determining the timing and mechanisms of climate change to uncovering detailed records of field behavior.