Article
Oceanography
Hui Zhou, Hengchang Liu, Shuwen Tan, Wenlong Yang, Yao Li, Xueqi Liu, Qiang Ren, William K. Dewar
Summary: This study investigated the structure and variations of the North Equatorial Countercurrent (NECC) in the far western Pacific Ocean during 2014-16, finding that the impact of the 2015/16 El Nino on the NECC was comparable to that of the extreme 1997/98 El Nino, showing baroclinic instability during the developing phase. This differs from traditional understanding and highlights the diverse eddy-mean flow interactions associated with various states of the El Nino-Southern Oscillation (ENSO).
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2021)
Article
Multidisciplinary Sciences
Thomas J. Browning, Mak A. Saito, Shungudzemwoyo P. Garaba, Xuechao Wang, Eric P. Achterberg, C. Mark Moore, Anja Engel, Matthew R. Mcllvin, Dawn Moran, Daniela Voss, Oliver Zielinski, Alessandro Tagliabue
Summary: The impact of climate change on ocean net primary productivity is highly uncertain, with phytoplankton nutrient limitation in the low-latitude Pacific Ocean playing a crucial role, but poorly constrained by observations. We found that changes in physical forcing resulted in consistent fluctuations in the strength of equatorial Pacific iron limitation through El Nino/Southern Oscillation (ENSO) cycles, which were overestimated by a state-of-the-art climate model. Our assessment provides a powerful approach for evaluating the realism of model projections of net primary productivity to climate changes.
Article
Oceanography
Youjia Zou, Xiangying Xi
Summary: This study shows that the intensity of westerly winds in the western equatorial Pacific remains relatively unchanged during most El Nino events, while an eastward equatorial current near the equator plays a significant role in causing the phenomenon.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2021)
Article
Multidisciplinary Sciences
Madison G. Shankle, Natalie J. Burls, Alexey V. Fedorov, Matthew D. Thomas, Wei Liu, Donald E. Penman, Heather L. Ford, Peter H. Jacobs, Noah J. Planavsky, Pincelli M. Hull
Summary: Recent studies have shown that in the early Pliocene/late Miocene period, the circulation regime in the equatorial Pacific was significantly different from modern times, leading to the influx of older, more acidic, and more nutrient-rich water into the region, resulting in enhanced productivity in the east Pacific despite weaker wind-driven upwelling.
Article
Geosciences, Multidisciplinary
Chao Liu, Wenjun Zhang, Fei-Fei Jin, Malte F. Stuecker, Licheng Geng
Summary: Quasi-decadal climate variability has been observed in the tropical Pacific based on 70 years of data. This variability is similar to the Central Pacific El Nino-Southern Oscillation (ENSO), but extends to higher latitudes in the subtropical Pacific. Nonlinear dynamical heating, primarily from strong El Nino events, is found to be the main driver of this variability, leading the sea surface temperatures by a quarter of its dominant period. This suggests that the observed quasi-decadal variability is fundamentally different from the oscillatory nature of ENSO.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Li-Chiao Wang, Thi Lan Dao, Jia-Yuh Yu
Summary: This study explores the dynamics of the equatorial Pacific upwelling annual cycle under global warming and finds a weakening trend, which could affect climate phenomena such as sea surface temperature, atmosphere-ocean interactions, and precipitation.
SCIENTIFIC REPORTS
(2022)
Article
Geosciences, Multidisciplinary
Yu-Shen Lin, Li-Chiao Wang, Jui-Lin F. Li
Summary: This study used CMIP6 models to investigate equatorial ocean currents and their influence on the biased westward extension of sea surface temperature anomalies (SSTA) during El Nino. The results show that the models simulate excessive westward ocean currents in the central equatorial Pacific, which suppresses the equatorial eastward ocean current anomalies in the El Nino developing phase. This leads to an overestimated zonal advective feedback and biases the westward extension of SSTA pattern.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Feng Tian, Rong-Hua Zhang, Xiujun Wang
Summary: During the El Nino to La Nina transitions in 1998 and 2010, there was a significant increase in surface chlorophyll in the eastern equatorial Pacific. The study shows that Indian Ocean warming plays an active role in remotely triggering super phytoplankton blooms in the region, through a combination of remote and local factors.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Meteorology & Atmospheric Sciences
Huijing Zhang, Wenjun Zhang, Xin Geng, Feng Jiang, Malte F. Stuecker
Summary: Many previous studies have shown that El Nino exhibits strong seasonality in its teleconnections and regional climate impacts. This seasonality is mainly due to the seasonal cycle of the eastern tropical Pacific SST background state and differs between different types of El Nino events.
JOURNAL OF CLIMATE
(2022)
Article
Geosciences, Multidisciplinary
Cong Guan, Feng Tian, Michael J. McPhaden, Shijian Hu, Fan Wang
Summary: Salinity anomalies in the central Pacific induce the strongest surface warming during both types of El Nino, tapering off to the east and west. The distinct sea surface salinity zonal structures between the two El Ninos amplify their difference in sea surface temperature magnitude by about 10%. Salinity effects on vertical mixing and entrainment account for the different eastern Pacific and central Pacific El Nino responses.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Meteorology & Atmospheric Sciences
Jonathan D. Beverley, Matthew Collins, F. Hugo Lambert, Robin Chadwick
Summary: Research suggests that future changes to the positive-phase ENSO teleconnection to the North Pacific/North America sector will weaken, largely due to anomalous circulation changes over the North Pacific. The study also indicates that changes in forcing from equatorial central Pacific precipitation anomalies are more significant than changes in the global basic state background circulation.
JOURNAL OF CLIMATE
(2021)
Article
Meteorology & Atmospheric Sciences
Ruikun Hu, Tao Lian, Jie Feng, Dake Chen
Summary: The positive phase of the Pacific meridional mode (PMM) is related to the onset of El Nino. Previous studies suggest that positive sea surface temperature anomalies (SSTAs) in the central equatorial Pacific (CEP) during positive PMM years primarily originate from the northeastern tropical Pacific (NETP) via positive wind-evaporation-SST feedback. However, our review and coupled model experiments show weak evidence and indicate that the impact of PMM on El Nino might be overestimated. Furthermore, a comprehensive understanding of the role of the tropical North Pacific on El Nino can only be achieved by considering the impact from the western North Pacific.
JOURNAL OF CLIMATE
(2023)
Article
Geosciences, Multidisciplinary
Chuanyu Liu, Dan Huo, Zhiyu Liu, Xiaowei Wang, Cong Guan, Jifeng Qi, Fan Wang
Summary: The barrier layer (BL) is a common expanded halocline layer in the western equatorial Pacific that inhibits the entrainment of colder thermocline water into the surface mixed layer (ML), facilitating the development of El Nino. However, recent studies have found frequent turbulent mixing in the BL, as strong as in the ML, leading to effective heat transfers across the isothermal layer (IL). The occurrence of BL mixing is widespread, ranging from 20% to 60%, and is more frequent during La Nina years compared to El Nino. Thicker ML, BL, and IL, weaker BL stratification, and lower temperature and higher salinity in the IL are associated with BL mixing. Further research is needed to understand the impact of BL mixing on El Nino development.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Nicholas T. Hitt, Hussein R. Sayani, Alyssa R. Atwood, Pamela R. Grothe, Christopher Maupin, Gemma K. O'Connor, Rachel M. Walter, Daniel Gebregiorgis, Madeleine E. Hardt, Yanbin Lu, Hai Cheng, R. Lawrence Edwards, Kim M. Cobb
Summary: This study demonstrates the utility of reconstructing twentieth century climate trends using an ensemble of multiple, short coral records, and shows a shift toward warmer and wetter conditions in the central equatorial Pacific since 1970.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Kilian Vos, Mitchell D. D. Harley, Ian L. L. Turner, Kristen D. D. Splinter
Summary: Analysis of satellite imagery covering over 8,300 km of sandy coastline reveals that the El Nino/Southern Oscillation drives coherent patterns of beach erosion and accretion around the Pacific Rim. Approximately one-third of all transects experience significant erosion during El Nino phases, while approximately one-quarter of all transects experience significant accretion during La Nina events.
Letter
Limnology
Thomas J. Browning, Xin Liu, Ruifeng Zhang, Zuozhu Wen, Jing Liu, Yaqian Zhou, Feipeng Xu, Yihua Cai, Kuanbo Zhou, Zhimian Cao, Yuanli Zhu, Dalin Shi, Eric P. Achterberg, Minhan Dai
Summary: Experimental results from the Philippine Sea indicate a gradient from nitrogen limitation in the north to nitrogen-iron co-limitation in the south, driving different phytoplankton growth responses. This large-scale phytoplankton response gradient is hypothesized to be climate sensitive and potentially important for regulating the distribution of predatory fish.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Alexandre B. Schneider, Andrea Koschinsky, Cristian H. Krause, Martha Gledhill, Leandro M. de Carvalho
Summary: Ultratrace concentrations of Ti were determined in samples collected from the Pará and Amazon estuaries into the Atlantic Ocean using catalytic differential pulse adsorptive stripping voltammetry. The study revealed non-conservative behavior of dissolved Ti along the mixing gradients, with strong removal at low salinities and enrichments at higher salinity ranges. The complex behavior of Ti along the mixing gradient in the dynamic system of the Amazon estuary highlights the key role of the estuary in controlling the fluxes of Ti into the Atlantic.
Article
Multidisciplinary Sciences
Zuozhu Wen, Thomas J. Browning, Yihua Cai, Rongbo Dai, Ruifeng Zhang, Chuanjun Du, Ruotong Jiang, Wenfang Lin, Xin Liu, Zhimian Cao, Haizheng Hong, Minhan Dai, Dalin Shi
Summary: Nitrogen fixation is vital for ocean productivity, but the exact mechanisms controlling this process are still unclear. This study shows that the supply ratio of iron:nitrogen is the most important factor in regulating N-2 fixation distribution in the tropical ocean.
Article
Environmental Sciences
Franziska Pausch, Florian Koch, Christel Hassler, Astrid Bracher, Kai Bischof, Scarlett Trimborn
Summary: This study investigates the responses of Southern Ocean phytoplankton under different climate change scenarios. It finds that under ocean acidification, the numerical dominance of diatoms is reduced in both future mixing scenarios, but their productivity increases.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Microbiology
Yuanli Zhu, Yuanyuan Feng, Thomas J. Browning, Zuozhu Wen, David J. Hughes, Qiang Hao, Ruifeng Zhang, Qicheng Meng, Mark L. Wells, Zhibing Jiang, P. A. K. N. Dissanayake, W. N. C. Priyadarshani, Lu Shou, Jiangning Zeng, Fei Chai
Summary: This study investigates the photophysiological variability in Trichodesmium assemblages using a multi-excitation FRR fluorometer. The results show that using a multi-LED measuring protocol can significantly increase the maximum photochemical efficiency of Trichodesmium. Distinct photophysiological differences were found between different locations, likely related to nutrient supply and physiological stress.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Environmental Sciences
Julia Oelker, Svetlana N. Losa, Andreas Richter, Astrid Bracher
Summary: UV radiation has significant impacts on the biogeochemical cycling in the ocean and the release of trace gases into the atmosphere. However, the current monitoring of UV radiation in the ocean is mostly done indirectly. Researchers have developed a method using the TROPOMI sensor to directly estimate the diffuse attenuation coefficients in different wavelength ranges, providing a new approach for global long-term monitoring.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Martha Gledhill, Adrienne Hollister, Michael Seidel, Kechen Zhu, Eric P. Achterberg, Thorsten Dittmar, Andrea Koschinsky
Summary: Dissolved organic matter (DOM) is an important component of Earth's hydrosphere and its interaction with trace metals (TMs) plays a crucial role in biogeochemical cycles. This study reveals that the biogeochemistry of TMs bound to DOM in the Amazon plume is primarily determined by the chemical nature of the metals.
Article
Meteorology & Atmospheric Sciences
M. Wendisch, M. Brueckner, S. Crewell, A. Ehrlich, J. Notholt, C. Luepkes, A. Macke, J. P. Burrows, A. Rinke, J. Quaas, M. Maturilli, V. Schemann, M. D. Shupe, E. F. Akansu, C. Barrientos-Velasco, K. Baerfuss, A-M Blechschmidt, K. Block, I. Bougoudis, H. Bozem, C. Boeckmann, A. Bracher, H. Bresson, L. Bretschneider, M. Buschmann, D. G. Chechin, J. Chylik, S. Dahlke, H. Deneke, K. Dethloff, T. Donth, W. Dorn, R. Dupuy, K. Ebell, U. Egerer, R. Engelmann, O. Eppers, R. Gerdes, R. Gierens, I. V. Gorodetskaya, M. Gottschalk, H. Griesche, V. M. Gryanik, D. Handorf, B. Harm-Altstaedter, J. Hartmann, M. Hartmann, B. Heinold, A. Herber, H. Herrmann, G. Heygster, I. Hoeschel, Z. Hofmann, J. Hoelemann, A. Huenerbein, S. Jafariserajehlou, E. Jaekel, C. Jacobi, M. Janout, F. Jansen, O. Jourdan, Z. Juranyi, H. Kalesse-Los, T. Kanzow, R. Kaethner, L. L. Kliesch, M. Klingebiel, E. M. Knudsen, T. Kovacs, W. Koertke, D. Krampe, J. Kretzschmar, D. Kreyling, B. Kulla, D. Kunkel, A. Lampert, M. Lauer, L. Lelli, A. von Lerber, O. Linke, U. Loehnert, M. Lonardi, S. N. Losa, M. Losch, M. Maahn, M. Mech, L. Mei, S. Mertes, E. Metzner, D. Mewes, J. Michaelis, G. Mioche, M. Moser, K. Nakoudi, R. Neggers, R. Neuber, T. Nomokonova, J. Oelker, I. Papakonstantinou-Presvelou, F. Paetzold, V. Pefanis, C. Pohl, M. van Pinxteren, A. Radovan, M. Rhein, M. Rex, A. Richter, N. Risse, C. Ritter, P. Rostosky, V. V. Rozanov, E. Ruiz Donoso, P. Saavedra Garfias, M. Salzmann, J. Schacht, M. Schaefer, J. Schneider, N. Schnierstein, P. Seifert, S. Seo, H. Siebert, M. A. Soppa, G. Spreen, I. S. Stachlewska, J. Stapf, F. Stratmann, I. Tegen, C. Viceto, C. Voigt, M. Vountas, A. Walbroel, M. Walter, B. Wehner, H. Wex, S. Willmes, M. Zanatta, S. Zeppenfeld
Summary: The (AC)(3) project, established in 2016, collected a wealth of data on the physical, chemical, and meteorological properties of the Arctic atmosphere, cryosphere, and upper ocean. Short-term changes and long-term trends in Arctic climate parameters have been identified, such as increased atmospheric moistening, regional storm activities, winter warming in specific regions, and decreasing sea ice thickness and snow depth on sea ice. The project also made advancements in atmospheric-ocean and radiative transfer models, and discovered local marine/biogenic sources for cloud condensation nuclei and ice nucleating particles. Cross-cutting activities are being developed to further synthesize the results and answer key questions.
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2023)
Article
Environmental Sciences
Jeyakumar Dhavamani, Aaron J. Beck, Martha Gledhill, Mohammad S. El-Shahawi, Mohammad W. Kadi, Iqbal M. I. Ismail, Eric P. Achterberg
Summary: This study investigated the leaching of six phthalic acid esters (PAEs) from three common consumer plastics and analyzed the effects of salinity, temperature, and ultraviolet irradiation (UVR) on leaching. The results showed significant leaching of dibutyl phthalate (DBP) and benzyl butyl phthalate (DEHP) during the experiment. The readsorption of PAEs at the surface removed a considerable amount of the leached PAEs in the dissolved phase.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Meteorology & Atmospheric Sciences
Eva Alvarez, Svetlana N. Losa, Astrid Bracher, Silke Thoms, Christoph Voelker
Summary: This study improves the estimation of the absorption coefficient (aPH(lambda)) of phytoplankton in the global ocean by considering the variability caused by the content of photoprotective carotenoids (PPCs) in the phytoplankton community.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Environmental Sciences
Jeyakumar Dhavamani, Aaron J. Beck, Martha Gledhill, Mohammad S. El-Shahawi, Mohammed I. Orif, Iqbal M. I. Ismail, Eric P. Achterberg
Summary: This study investigated the abundance and correlation of plastic debris (PDs) and phthalic acid esters (PAEs) in seawater from Sharm Obhur and the Red Sea. The results showed higher concentrations of PAEs compared to PDs. DEP, DBP, and DEHP were the predominant PAEs detected. Furthermore, the degradation and adsorption of PAEs were higher in Sharm Obhur and on the shelf compared to the shelf break, while the abundance of PDs showed no significant difference among the different areas.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Xuerong Sun, Robert J. W. Brewin, Shubha Sathyendranath, Giorgio Dall'Olmo, Ruth Airs, Ray Barlow, Astrid Bracher, Vanda Brotas, Malika Kheireddine, Tarron Lamont, Emilio Maranon, Xose Anxelu G. Moran, Dionysios E. Raitsos, Fang Shen, Gavin H. Tilstone
Summary: Understanding the response of phytoplankton to climate change is crucial, and satellite remote sensing of ocean colour is the only means of monitoring phytoplankton at large scales. However, addressing ambiguity in ocean colour signal is necessary for developing algorithms for climate change studies. Enriching ocean colour data with sea surface temperature information can help tackle this issue.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Environmental Sciences
Perumthuruthil Suseelan Vishnu, Hongyan Xi, Justin Del Bel Belluz, Midhun Shah Hussain, Astrid Bracher, Maycira Costa
Summary: Monitoring the spatial and seasonal dynamics of phytoplankton functional types in coastal oceans is important for understanding fisheries production, water quality changes, and carbon export. This study used OLCI imagery and CHEMTAX software to characterize the seasonal dynamics of major phytoplankton functional types on the west coast of Canada. The results showed reliable performance for diatoms and raphidophytes, and the best performance for total chlorophyll-a concentration. The study also observed spring and fall diatom blooms and localized summer raphidophyte blooms.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Moritz K. Lehmann, Daniela Gurlin, Nima Pahlevan, Krista Alikas, Janet Anstee, Sundarabalan V. Balasubramanian, Claudio C. F. Barbosa, Caren Binding, Astrid Bracher, Mariano Bresciani, Ashley Burtner, Zhigang Cao, Arnold G. Dekker, Courtney Di Vittorio, Nathan Drayson, Reagan M. Errera, Virginia Fernandez, Dariusz Ficek, Cedric G. Fichot, Peter Gege, Claudia Giardino, Anatoly A. Gitelson, Steven R. Greb, Hayden Henderson, Hiroto Higa, Abolfazl Irani Rahaghi, Cedric Jamet, Dalin Jiang, Thomas Jordan, Kersti Kangro, Jeremy A. Kravitz, Arne S. Kristoffersen, Raphael Kudela, Lin Li, Martin Ligi, Hubert Loisel, Steven Lohrenz, Ronghua Ma, Daniel A. Maciel, Tim J. Malthus, Bunkei Matsushita, Mark Matthews, Camille Minaudo, Deepak R. Mishra, Sachidananda Mishra, Tim Moore, Wesley J. Moses, Ha Nguyen, Evlyn M. L. M. Novo, Stefani Novoa, Daniel Odermatt, David M. O'Donnell, Leif G. Olmanson, Michael Ondrusek, Natascha Oppelt, Sylvain Ouillon, Waterloo Pereira Filho, Stefan Plattner, Antonio Ruiz Verdu, Salem I. Salem, John F. Schalles, Stefan G. H. Simis, Eko Siswanto, Brandon Smith, Ian Somlai-Schweiger, Mariana A. Soppa, Evangelos Spyrakos, Elinor Tessin, Hendrik J. van der Woerd, Andrea Vander Woude, Ryan A. Vandermeulen, Vincent Vantrepotte, Marcel R. Wernand, Mortimer Werther, Kyana Young, Linwei Yue
Summary: The development of algorithms for remote sensing of water quality requires a large amount of in situ data to consider the bio-geo-optical diversity of inland and coastal waters. The GLORIA dataset includes 7,572 curated hyperspectral remote sensing reflectance measurements at 1 nm intervals within the 350 to 900 nm wavelength range, contributed by researchers affiliated with 59 institutions worldwide. This dataset provides a comprehensive reference for practitioners planning similar measurements and enables scientific and technological advancement towards operational regional and global water quality monitoring.
Article
Geosciences, Multidisciplinary
Andre Valente, Shubha Sathyendranath, Vanda Brotas, Steve Groom, Michael Grant, Thomas Jackson, Andrei Chuprin, Malcolm Taberner, Ruth Airs, David Antoine, Robert Arnone, William M. Balch, Kathryn Barker, Ray Barlow, Simon Belanger, Jean-Francois Berthon, Yngve Borsheim, Astrid Bracher, Vittorio Brando, Robert J. W. Brewin, Elisabetta Canuti, Francisco P. Chavez, Andres Cianca, Herve Claustre, Lesley Clementson, Richard Crout, Afonso Ferreira, Scott Freeman, Robert Frouin, Carlos Garcia-Soto, Stuart W. Gibb, Ralf Goericke, Richard Gould, Nathalie Guillocheau, Stanford B. Hooker, Chuamin Hu, Mati Kahru, Milton Kampel, Holger Klein, Susanne Kratzer, Raphael Kudela, Jesus Ledesma, Steven Lohrenz, Hubert Loisel, Antonio Mannino, Victor Martinez-Vicente, Patricia Matrai, David McKee, Brian G. Mitchell, Tiffany Moisan, Enrique Montes, Frank Muller-Karger, Aimee Neeley, Michael Novak, Leonie O'Dowd, Michael Ondrusek, Trevor Platt, Alex J. Poulton, Michel Repecaud, Rudiger Roettgers, Thomas Schroeder, Timothy Smyth, Denise Smythe-Wright, Heidi M. Sosik, Crystal Thomas, Rob Thomas, Gavin Tilstone, Andreia Tracana, Michael Twardowski, Vincenzo Vellucci, Kenneth Voss, Jeremy Werdell, Marcel Wernand, Bozena Wojtasiewicz, Simon Wright, Giuseppe Zibordi, Sukru Besiktepe
Summary: This article presents a global in situ data set for validating ocean colour products. The data set includes various observation variables and has undergone homogenization, quality control, and merging processes.
EARTH SYSTEM SCIENCE DATA
(2022)