Article
Oceanography
Yushan Qu, Shengpeng Wang, Zhao Jing, Hong Wang, Lixin Wu
Summary: Vertical motions induced by mesoscale eddies in the upper ocean play a vital role in the heat transport over the global ocean. This study addresses the spatial structure of vertical eddy velocity and associated heat flux in the Kuroshio-Oyashio Extension. The results show that the vertical eddy velocity is enhanced at edges of mesoscale eddies with a maximum magnitude of 0.8 m day(-1) for anticyclonic eddies and 0.5 m day(-1) for cyclonic eddies. The associated vertical heat flux is upward, reaching 52 and 32 W m(-2) along the periphery of anticyclonic and cyclonic eddies, respectively. Diagnostic analysis suggests that the enhanced vertical eddy motions at eddy edges are primarily attributed to the ageostrophic secondary circulation (ASC) under the turbulent thermal wind balance.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Geosciences, Multidisciplinary
Tongya Liu, Ryan Abernathey
Summary: In this study, a global Lagrangian eddy dataset GLED v1.0 is presented using the Lagrangian-averaged vorticity deviation (LAVD) method. The dataset includes general features of eddies and particle trajectories trapped by coherent eddies. The statistical features of Lagrangian eddies are compared with those of the widely used sea surface height (SSH) eddies.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Geosciences, Multidisciplinary
Lixin Qu, Leif Thomas, Jonathan Gula
Summary: The study found that storm-generated near-inertial waves (NIWs) were observed on the seafloor of the Straits of Florida, and numerical simulations provided evidence that these waves can enhance mixing in the seafloor of the straits. This mixing could potentially influence benthic deep-water coral ecosystems and properties of intermediate water masses.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Marcela Cabrera, Gabriel M. Moulatlet, Bryan G. Valencia, Luis Maisincho, Rocio Rodriguez-Barroso, Gemma Albendin, Ayda Sakali, Oscar Lucas-Solis, Bruno Conicelli, Mariana Capparelli
Summary: The study found microplastics accumulation above 5000 meters a.s.l. in the Antisana Glacier in the northern Andes cordillera of Ecuador. The microplastics mainly existed in fiber shape, with composition including polyurethane, polyethylene, polyamide, polyester, and high-density polyethylene. The origins of the microplastics may be from the east, transported by eastward air flow across the region.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Wangyuan Zhu, Mantravadi Venkata Subrahmanyam, Liuzhu Wang, Biyun Guo
Summary: Typhoon Haikui (2012) made landfall on the east coast of China after occurring in the northwestern Pacific Ocean, bringing heavy rainfall and strong winds. The right side of the typhoon track experienced a cooling of 3 degrees C in sea surface temperature (SST) due to Ekman transport and upwelling, while the left side had a lower SST cooling mainly caused by rainfall. Heavy precipitation occurred on both sides of the typhoon track, with higher rainfall on the left side. This paper explains the dynamic process between atmospheric and oceanographic parameters during Typhoon Haikui and verifies the variations in chlorophyll and sea surface height data.
Article
Environmental Sciences
Xiaoyun Sun, Yue Zhou, Tianliang Zhao, Yongqing Bai, Tao Huo, Liang Leng, Huan He, Jing Sun
Summary: Vertical wind shear (VWS) has a significant impact on the vertical mixing of air pollutants, especially PM2.5 concentration. This study focuses on the influence of VWS on surface PM2.5 changes in Changsha (CS) and Jingmen (JM), two urban sites in central China. The correlation between wind speed and PM2.5 concentration differs in clean and polluted conditions and varies between the two sites.
Article
Environmental Sciences
Jinbo Wang, Hector Torres, Patrice Klein, Alexander Wineteer, Hong Zhang, Dimitris Menemenlis, Clement Ubelmann, Ernesto Rodriguez
Summary: Near Inertial Oscillations (NIOs) are ocean oscillations forced by intermittent winds, most active at mid-latitudes. This study assesses the potential of a new satellite mission concept, OSYSEA, to recover wind-forced NIOs from co-located winds and currents. Results show that NIOs can be accurately recovered using the ODYSEA spatial and temporal resolution.
Article
Environmental Sciences
Hector Torres, Alexander Wineteer, Patrice Klein, Tong Lee, Jinbo Wang, Ernesto Rodriguez, Dimitris Menemenlis, Hong Zhang
Summary: The kinetic energy transfer between the atmosphere and oceans, known as wind work, plays a significant role in ocean dynamics. Recent numerical estimates have shown a nearly fivefold increase in global wind work amplitude compared to those reported a decade ago due to the inclusion of a broader range of spatial and temporal scales. However, existing satellite observations do not fully capture this range. The ODYSEA satellite mission, which utilizes a wide-swath measurement approach, performs well in estimating wind work globally, except at latitudes north of 40 degrees N during summer.
Article
Environmental Sciences
Sheng Yang, Lu Zhang, Mingsen Lin, Juhong Zou, Bo Mu, Hailong Peng
Summary: The Chinese new marine dynamic environment satellite HY-2D, equipped with HSCAT-D scatterometer, was launched on May 19, 2021. This study validated the wind products observed by HSCAT-D by comparing them with wind data from NDBC buoys and ECMWF model. The statistical results showed a good agreement between HSCAT-D winds and buoy wind measurements, with a wind speed STD of 0.78 m/s and direction RMSE of 14.10 degrees. Comparison with other scatterometers' wind data and spectral analysis demonstrated the reliability and characteristics of HSCAT-D wind products. The ETC results confirmed the good quality and calibration of HSCAT-D wind product.
Article
Optics
Stefan G. H. Simis, Peter D. Hunter, Mark W. Matthews, Evangelos Spyrakos, Andrew Tyler, Diana Vaiciute
Summary: Estimating water constituent concentration using hyperspectral reflectance relies on a method that retrieves the backscattering coefficient from selected wavebands and improves the estimation of chlorophyll-a.
Article
Remote Sensing
Chenxu Ji, Yuanzhi Zhang, Qiuming Cheng, Jin Yeu Tsou
Summary: This study utilized a fusion of multi-source satellite data by the DINCAE method to investigate daily sea surface responses to typhoons, revealing three different response patterns over the East China Sea. The research findings can help overcome the limitations caused by cloud blocking and provide insights into the various response mechanisms of the ocean to typhoons.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2021)
Article
Oceanography
S. M. Hamze-Ziabari, U. Lemmin, M. Foroughan, R. S. Reiss, D. A. Barry
Summary: Dome-shaped thermoclines form in the center of cyclonic gyres in large lakes, caused by pelagic upwelling. Field observations in Lake Geneva confirm the presence of intense pelagic upwelling within the surface mixed layer. A 3D numerical model suggests that nonlinear divergent flows and 3D ageostrophic strain are responsible for the chimney-like upwelling in the surface mixed layer.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
Tesha Toolsee, Tarron Lamont
Summary: The sub-Antarctic Prince Edward Islands (PEIs) in the Southern Ocean have significant ecological importance due to their large populations of marine mammals and seabirds. This study examined the interannual variability and longer-term trends of Sea Surface Temperature (SST), wind forcing, and surface circulation at the PEIs. The results showed weak and statistically insignificant long-term trends, with stronger variability observed at seasonal and shorter time scales. The Antarctic Circumpolar Wave was found to be a significant factor in interannual and decadal-scale variability, while the influence of El Nino Southern Oscillation was weak. The PEIs experience substantial local and regional atmospheric and oceanic variability, which masks longer-term variations observed elsewhere in the Southern Ocean.
Article
Environmental Sciences
Yihui Zhang, Weiping Hu, Yuemin Hu, Zhaoliang Peng
Summary: Bottom traps installed in Lake Chaohu, China, effectively collect internal pollutants in suspended sediments. The traps create static water environments, leading to significant reductions in organic matter and nitrogen and phosphorus levels. This method has broad potential for removing internal pollutants in shallow lakes with minimal impact on the ecosystem.
JOURNAL OF SOILS AND SEDIMENTS
(2021)
Article
Oceanography
Jinliang Liu, Jianguo Yuan, Jun-Hong Liang
Summary: Accurate parameterization of diffusivity and turbulent kinetic energy dissipation rate is crucial for simulating reactive tracers like cohesive sediments. We implemented a suitable second-order closure parameterization in the COAWST model, which reproduced the key profiles and water depth dependence of different factors in wave-driven Langmuir turbulence.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Jackie Branyon, Arnoldo Valle-Levinson, Ismael Marino-Tapia, Cecilia Enriquez
Summary: Investigation of wave-driven circulation and inlet dynamics in a Caribbean fringing reef lagoon was conducted using velocity transect data collected over diurnal tidal cycles. Variations in inlet width and bathymetry between the Boca Chica and Boca Grande inlets resulted in atypical flow circulation patterns. The dynamics at the inlets showed maximum outflows towards the sea and complex vertical structures with diverging flows.
ESTUARIES AND COASTS
(2022)
Article
Environmental Sciences
Arnoldo Valle-Levinson, Cecilia Enriquez, Ismael Marino
Summary: Water level measurements at a highly dissipative coastal lagoon revealed that the amplitude of main astronomic constituents attenuated quickly with increasing sub-basins, while the semidiurnal constituent S2 increased in amplitude in the fourth sub-basin. There were two dominant modes found in the subtidal water levels, one related to northerly winds and the other linked to Trade winds that dominate the region.
ESTUARIES AND COASTS
(2022)
Review
Oceanography
Susannah J. Buchan, Ivan Perez-Santos, Diego Narvaez, Leonardo Castro, Kathleen M. Stafford, Mark F. Baumgartner, Arnoldo Valle-Levinson, Paulina Montero, Laura Gutierrez, Constanza Rojas, Giovanni Daneri, Sergio Neira
Summary: This study examines the temporal variation in blue whale acoustic occurrence and prey backscatter on both seasonal and submonthly scales, combining passive acoustic, hydroacoustic, and oceanographic observations. Results show a strong correlation between blue whale acoustic presence and zooplankton backscatter, with song calls following a seasonal cycle and D-calls responding to short-term environmental variations. Spring tides and short-lived events of increased wind stress were found to contribute to prey aggregation and increase blue whale acoustic presence over specific cycles.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Engineering, Civil
Carmen Zarzuelo, Alejandro Lopez-Ruiz, Arnoldo Valle-Levinson, Manuel Diez-Minguito, Miguel Ortega-Sanchez
Summary: This paper investigates the impact of bridge-pilling modifications on tidal flow in Cadiz Bay and reveals that the position of the bridge pile can decrease tidal amplitude, cause phase lag, distort the tidal wave, affect the depth of the pycnocline, and act as an obstacle for sediment flux. The findings are significant for the design and modification of similar infrastructures.
COASTAL ENGINEERING
(2022)
Article
Oceanography
Braulio Juarez, Arnoldo Valle-Levinson, Alberto Canestrelli
Summary: This study investigates a mechanism for salt-plug formation that disregards evaporation processes and involves a buoyant coastal current modified by wind stresses. The numerical experiments show that the formation of salt plugs is influenced by tidal flushing and wind forcing.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Cecile Pujol, Ivan Perez-Santos, Alexander Barth, Aida Alvera-Azcarate
Summary: Marine heatwaves (MHWs) are warm-water anomaly events occurring in the open ocean and coastal areas. Their frequency and intensity are increasing due to global warming. A global assessment of MHWs in Central and South Chile revealed a high frequency in Northern Patagonia and increasing duration of events. A specific MHW in 2016 lasted for 5 months, the longest recorded over the period of 1982-2020, and was influenced by warm waters from the extratropical South Pacific Ocean and atmospheric conditions.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Braulio Juarez, Savanna A. Stockton, Katherine A. Serafin, Arnoldo Valle-Levinson
Summary: Hurricane Irma caused significant impacts on the Florida peninsula, especially the east coast. This study used observational data to analyze the effects of ocean and river forces on flooding, finding that the flood was initiated by the ocean and exacerbated by river discharge.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Camilo Rodriguez-Villegas, Rosa Figueroa, Ivan Perez-Santos, Carlos Molinet, Gonzalo S. Saldias, Sergio A. Rosales, Gonzalo Alvarez, Pamela Linford, Patricio A. Diaz
Summary: Harmful Algal Blooms (HAB) are a significant global issue, with the dinoflagellate species Alexandrium catenella being responsible for the toxin named Paralytic Shellfish Poisoning (PSP). Understanding the origins and formation of these blooms is essential for prediction. Previous research in Chilean Patagonia has focused on coastal areas, neglecting the adjacent oceanic regions. Through a combination of field studies and modeling approaches, it was found that the submarine canyons in the continental shelf off northern Chilean Patagonia enhance coastal upwelling, increasing the risk of resuspension of A. catenella resting cysts.
MARINE POLLUTION BULLETIN
(2022)
Review
Oceanography
Joseph R. Crosswell, Francisco Bravo, Ivan Perez-Santos, Geoffrey Carlin, Nagur Cherukuru, Cassie Schwanger, Rob Gregor, Andrew D. L. Steven
Summary: This study examines the functional differences between three major fjords in the Chiloe Inland Sea (CIS) in northern Patagonia and identifies the external forcing and local geomorphology as key factors shaping biogeochemical cycling in fjords. The findings have important implications for the sustainable management of fjords and adaptation to climate change and anthropogenic stressors.
PROGRESS IN OCEANOGRAPHY
(2022)
Article
Oceanography
S. Rickerich, L. Ross, A. Valle-Levinson
Summary: This study investigates the impact of tidal range and wave conditions on the generation of overtides through numerical simulations. The results suggest that increasing wave height amplifies overtide current velocities, while changes in wave period and direction have a lesser effect. The mechanisms of bottom stress, pressure gradient, and bottom wave streaming are identified as key factors in enhancing overtide generation.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Chemistry, Medicinal
Angela M. Baldrich, Patricio A. Diaz, Gonzalo Alvarez, Ivan Perez-Santos, Camila Schwerter, Manuel Diaz, Michael Araya, Maria Gabriela Nieves, Camilo Rodriguez-Villegas, Facundo Barrera, Concepcion Fernandez-Pena, Sara Arenas-Uribe, Pilar Navarro, Beatriz Reguera
Summary: Dinophysis acuminata and D. acuta are the main producers of lipophilic toxins in temperate coastal waters of Southern Chile. D. acuta is considered the major cause of DSP outbreaks in the region, while the toxicity of D. acuminata remains uncertain. Intensive sampling in two northern Patagonian fjords revealed the dominance of D. acuminata and low levels of D. acuta. The vertical gradients and oceanographic conditions were found to promote the blooms of these two species.
Article
Food Science & Technology
Patricio A. Diaz, Carlos Molinet, Miriam Seguel, Edwin J. Niklitschek, Manuel Diaz, Gonzalo Alvarez, Ivan Perez-Santos, Daniel Varela, Leonardo Guzman, Camilo Rodriguez-Villegas, Rosa Figueroa
Summary: This study examined the spatial and temporal dynamics of PSP toxicity in clams in two fishing grounds in southern Chile. The results showed differences in the spatial variability and temporal dynamics of PSP toxicity.
Article
Engineering, Marine
Carmen Zarzuelo, Arnoldo Valle-Levinson, Alejandro Lopez-Ruiz, Manuel Diez-Minguito, Miguel Ortega-Sanchez
Summary: Marine structures have significant impacts on the hydrodynamics in shallow coastal areas, as observed in the Bay of Cadiz. This study focuses on the momentum balance and wakes generated by bridge piles in a well-mixed estuary. The results indicate that advection plays a similar role as barotropicity, while baroclinicity only matters during the summer.
Article
Environmental Sciences
Patricio A. Diaz, Ivan Perez-Santos, Leila Basti, Rene Garreaud, Elias Pinilla, Facundo Barrera, Alfredo Tello, Camila Schwerter, Sara Arenas-Uribe, Camila Soto-Riquelme, Pilar Navarro, Manuel Diaz, Gonzalo Alvarez, Pamela M. Linford, Robinson Altamirano, Guido Mancilla-Gutierrez, Camilo Rodriguez-Villegas, Rosa Figueroa
Summary: Harmful algal blooms in southern Chile pose a serious threat to various industries, including public health, tourism, artisanal fisheries, and aquaculture. The recent bloom of Heterosigma akashiwo in Comau Fjord resulted in significant economic losses for the salmon farming industry. The bloom was influenced by factors such as weather patterns and nutrient injection.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)