Article
Environmental Sciences
Yanguang Liu, Yue Qiu, Dongling Li, Antonina V. Artemova, Yuying Zhang, Aleksandr A. Bosin, Sergey A. Gorbarenko, Qingsong Liu, Debo Zhao, Longbin Sha, Yi Zhong
Summary: This study investigates changes in sea-ice coverage, biological productivity, and sea surface temperature in the subarctic Pacific Ocean since 32 kyr. It reveals an enhanced North Pacific surface water stratification during the last glacial period, which limited the siliceous productivity supply. The increase in atmospheric pCO(2) and nutrient- and CO2-rich waters led to a productivity peak during the Bolling/Allerod warm interval. The northward shift of the westerly winds and the gyre boundary likely caused changes in heat transport, biogeochemistry, and hydroclimate in the North Pacific.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Kristopher B. Karnauskas, Ulla K. Heede, Lei Zhang
Summary: The warming of the eastern Pacific strongly influences the future changes in Atlantic hurricanes, particularly the effect of El Nino. The changes include the formation regions of hurricanes and the intensity of the El Nino/La Nina signal.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Jiangong Wei, Tingting Wu, Xiguang Deng, Syed Waseem Haider, Sanober Kahkashan, Shengxiong Yang
Summary: Seafloor methane emissions have significant impacts on global climate change and ocean acidification, but systematic knowledge of submarine methane seepage is lacking. A recent geological survey on the Makran continental margin detected numerous gas flares, with methane flux accounting for a small percentage of global emissions. Methane flares disappeared in the water column, indicating oxidation or dissolution by seawater.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Ecology
Thulasi Thena, Kuppusamy Mohan, Muthusamy Prakasam, Kothandaraman Saravanan
Summary: The strong relationship between benthic foraminifera's habitat and morphological characteristics to their surrounding environment are dominant component in marine community, particularly in the Cascadia Margin at NE Pacific Ocean during the Pleistocene. The study indicates that the relative abundance rate of benthic foraminiferal community decreases with increasing core depth, indicating the influence of less ventilated and nutrient-enriched North Pacific Intermediate Water (NPIW). The disappearance of benthic faunas throughout the Early-Middle Pleistocene Transition (EMPT) period is attributed to increased cyclic seasonality and decreased food supply.
REGIONAL STUDIES IN MARINE SCIENCE
(2021)
Article
Oceanography
Ashley Arroyo, Mary-Louise Timmermans, Isabela Le Bras, William Williams, Sarah Zimmermann
Summary: The Canada Basin in the Arctic Ocean has experienced significant changes in ocean properties, particularly a warming of the Pacific Summer Water layer. This study analyzes the corresponding changes in dissolved oxygen (O-2) to gain insights into the physics, biology, pathways, and evolution of the Pacific Summer Water. O-2 observations from 2003 to 2021 indicate that the warming of the Pacific Summer Water layer is accompanied by a decrease in O-2 concentrations. The combined influences of physical and biological changes on O-2 concentrations in the Pacific Summer Water are assessed through the analysis of nutrients and other biogeochemical properties. Surface warming and decreased solubility account for O-2 decreases in the upper portion of the Pacific Summer Water, while a combination of warming-related solubility decrease and increased organic matter breakdown explain larger O-2 changes in the deeper portion. The decreasing O-2 in the warming Arctic Ocean is consistent with O-2 trends in global warming oceans, emphasizing the importance of continued observations and analyses.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Geosciences, Multidisciplinary
Samuel C. Mogen, Nicole S. Lovenduski, Allysa R. Dallmann, Luke Gregor, Adrienne J. Sutton, Steven J. Bograd, Nathali Cordero Quiros, Emanuele Di Lorenzo, Elliott L. Hazen, Michael G. Jacox, Mercedes Pozo Buil, Stephen Yeager
Summary: This study characterizes the biogeochemical properties of the Eastern North Pacific upper ocean during the Winter of 2013-2014 using observations and models, and finds that the Blob is associated with increased aragonite saturation and decreased oxygen concentration.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Baolan Wu, Lixiao Xu
Summary: Our study finds that the multidecadal variability of the North Pacific subtropical fronts (STFs) is controlled by the Atlantic Multidecadal Oscillation (AMO) via subtropical mode water variability. Similarly, our study proposes that the variability of the eastern STF (ESTF) is modulated by the Pacific Decadal Oscillation (PDO) via central mode water variability, quasi-synchronously on multidecadal time scales. The dominant factor controlling the low-frequency variability of the western STF (WSTF) and ESTF is different, which has important implications for North Pacific climate variability.
JOURNAL OF CLIMATE
(2023)
Article
Meteorology & Atmospheric Sciences
Pei-ken Kao, Chi-Cherng Hong, An-Yi Huang, Chih-Chun Chang
Summary: This study aimed to enhance our understanding of the cross-basin interaction between the North Atlantic and North Pacific. The results show that the cross-basin interaction in the interannual sea surface temperature (SST) between the Pacific meridional mode (PMM) and North Atlantic tripole (NAT) has become stronger since the 1990s. Observations indicate that this enhancement is associated with the interdecadal variations of the NAT and PMM, which have become significantly and positively coherent since the 1990s. The observations also reveal that the NAT-forced atmospheric large-scale circulation anomaly has a significant lag impact on the PMM. On the other hand, the PMM-induced middle-upper atmospheric teleconnection, a North Atlantic Oscillation (NAO)-like circulation anomaly, provides positive feedback to the NAT. Numerical experiments suggest that the enhancement of the NAT-PMM interaction since the 1990s primarily results from the eastward shift of PMM-associated convection.
JOURNAL OF CLIMATE
(2022)
Article
Meteorology & Atmospheric Sciences
Zhen Lv, Jun-Chao Yang, Xiaopei Lin, Yu Zhang
Summary: This study suggests that the North Atlantic forcing plays a more significant role than the tropical Pacific forcing in the decadal prediction of sea surface temperature (SST) variability in the North Pacific. By removing the North Atlantic forcing, the prediction skill of NP SST decreases, indicating its strong contribution to the long-term prediction. The research emphasizes the need for improving the simulation of the Atlantic trans-basin effect for better predicting NP climate.
JOURNAL OF CLIMATE
(2022)
Article
Geosciences, Multidisciplinary
Ekaterina Ovsepyan, Elena Ivanova, Martin Tetard, Lars Max, Ralf Tiedemann
Summary: The study semi-quantitatively estimated the dissolved oxygen concentrations in the western Bering Sea during the deglaciation, revealing distinct changes in oxygen content in intermediate and deep waters during different periods. The variations in oxygen concentrations in the intermediate depths were linked to the North Atlantic climate, while those in the deep waters were associated with changes in the circulation of southern-sourced waters and amplified by Northern Hemisphere climate warming. The region of the Bering Sea and sea-level oscillations significantly contributed to the magnitude of oxygenation changes during the last deglaciation, with more pronounced changes observed in the Bering and Okhotsk marginal seas compared to the open-ocean continental margin and abyssal settings of the North Pacific.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
S. V. S. Brand, C. J. Prend, L. D. Talley
Summary: Much of the salty, high oxygen North Atlantic Deep Water (NADW) leaving the Atlantic flows through the Argentine Basin, where it is diluted by fresher, low oxygen Circumpolar Deep Water (CDW). This mixing of deep water masses is often overlooked in the zonally averaged description of the overturning circulation. Here, we show that intense mixing occurs along the western boundary: (a) extreme, isolated oxygen/temperature anomalies recorded by three autonomous biogeochemical floats suggest that subsurface eddies can inject relatively unmodified CDW far into the northwestern Argentine Basin, and (b) moderate, numerous temperature/salinity anomalies indicate a mixing zone from Rio Grande Rise to the Malvinas Current. This western eddy pathway shortcuts the gyre-scale cyclonic route for CDW inferred from most previous studies. Significantly, CDW dilution of NADW affects the properties of deep waters that upwell in the Southern Ocean, and hence the connection between Northern and Southern Hemisphere polar climates.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Sudipta Sarkar, Manuel Moser, Christian Berndt, Mechthild Doll, Christoph Boettner, Wu-Cheng Chi, Dirk Klaeschen, Christophe Galerne, Jens Karstens, Sonja Geilert, C. Mortera-Gutierrez, Christian Hensen
Summary: Seafloor heat flow variations in the Guaymas Basin are influenced by high sedimentation rates and intrusions of magma. The study shows that sedimentation suppresses lithospheric heat flow, while recent igneous intrusions and fluid flow elevate the surface heat flow significantly.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Engineering, Civil
Yu Chen, Zhongdong Duan, Jian Yang, Yi Deng, Tiantian Wu, Jinping Ou
Summary: The study shows that future climate change will lead to changes in typhoon activities, including shifts in typhoon tracks and an increase in the proportion of super typhoons, which will increase typhoon risks in East Asia.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2021)
Article
Geosciences, Multidisciplinary
Jane A. Rudebusch, Nancy G. Prouty, James E. Conrad, Janet T. Watt, Jared W. Kluesner, Jenna C. Hill, Nathaniel C. Miller, Sally J. Watson, Jess I. T. Hillman
Summary: Previous studies suggest a link between current ocean warming, hydrate dissociation, and methane emissions along the Cascadia Subduction Zone. However, this connection may not consider regional geologic and structural complexities driving methane seepage. By expanding the seep database and conducting spatial and statistical analyses, this study reveals non-random distribution patterns of seeps, occurring in canyons and topographic highs instead of the landward limit of the gas hydrate stability zone. The findings suggest a primary structural control on seep distribution, particularly related to the location of the outer arc high and the landward limit of the gas hydrate stability zone.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Environmental Sciences
Satheeswaran Thangaraj, Hyo-Ryeon Kim, Jang-Mu Heo, Seunghyun Son, Jongseong Ryu, Jong-Woo Park, Ju-Hyoung Kim, Seo-Young Kim, Hae-Kun Jung, Il-Nam Kim
Summary: Prokaryotes in the Western North Pacific Ocean play a crucial role in marine nitrogen and methane cycles. This study examined the impact of ocean warming, acidification, deoxygenation, and anthropogenic-nitrogen-deposition on the community changes and metabolic modifications of prokaryotes in different layers of the ocean. The results shed light on the effects of climate change on the open ocean ecosystem and emphasize the importance of climate drivers in nitrogen and methane emissions.
MARINE POLLUTION BULLETIN
(2023)
Article
Geochemistry & Geophysics
H. Paul Johnson, Una K. Miller, Marie S. Salmi, Evan A. Solomon
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2015)
Article
Geochemistry & Geophysics
H. Paul Johnson, Joan S. Gomberg, Susan L. Hautala, Marie S. Salmi
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2017)
Article
Geosciences, Multidisciplinary
O. Wurl, K. Bird, M. Cunliffe, W. M. Landing, U. Miller, N. I. H. Mustaffa, M. Ribas-Ribas, C. Witte, C. J. Zappa
GEOPHYSICAL RESEARCH LETTERS
(2018)
Article
Oceanography
Susan L. Hautala
PROGRESS IN OCEANOGRAPHY
(2018)
Article
Geosciences, Multidisciplinary
P. Old, S. L. Hautala, L. Thompson
GEOPHYSICAL RESEARCH LETTERS
(2019)
Article
Geochemistry & Geophysics
Joan Gomberg, Susan Hautala, Paul Johnson, Steve Chiswell
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Geosciences, Multidisciplinary
Susan L. Hautala, Douglas E. Hammond
GEOPHYSICAL RESEARCH LETTERS
(2020)
Article
Engineering, Ocean
Seth F. Zippel, J. Thomas Farrar, Christopher J. Zappa, Una Miller, Louis St Laurent, Takashi Ijichi, Robert A. Weller, Leah McRaven, Sven Nylund, Deborah Le Bel
Summary: Upper-ocean turbulence is important for weather and climate, but current understanding is lacking. A new method using long-enduring moorings and pulse-coherent ADCPs can accurately measure turbulent kinetic energy dissipation rates. Differences in turbulence estimates from different platforms may be influenced by vertical temperature profiles and barrier layers.
JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY
(2021)
Article
Geochemistry & Geophysics
J. Gomberg, K. Ariyoshi, S. Hautala, H. P. Johnson
Summary: This study utilizes data measured by the DONET system in the Nankai Earthquake Zone to explore seismic shaking-triggered sediment slope failures and gravity flows. Although the experiment did not provide evidence that earthquake shaking initiated these phenomena, the research offers valuable lessons and inputs for future studies in this field.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
H. Paul Johnson, Susan G. Merle, Tor A. Bjorklund, Susan L. Hautala, Tamara Baumberger, Sharon L. Walker, Junzhe Liu, Nicholas D. Ward, Chenyu Wang
Summary: Methane gas plumes have been found in the seafloor of the Puget Sound estuary, associated with major fault zones. Acoustic data confirmed the presence of 349 individual bubble plumes. Analysis of samples suggests a deep fluid source for the methane gas. However, these emission sites lack thermal and chemical anomalies seen in similar environments.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Susan L. Hautala, Garrett Finucane
Summary: This study used GO-SHIP's observational data to test the assumption of steady-state for deep ocean circulation, finding that, except for boundary currents, most regions in the deep ocean show quasi-steady-state planetary-scale potential density gradients during the modern observational period, with higher variability in some areas and shorter sections.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
G. Finucane, S. Hautala
Summary: The abyssal circulation in the interior portions of the Brazil Basin and northern Argentine Basin were estimated using an overdetermined inverse method conserving neutral surface planetary potential vorticity and salinity. This study found that the Antarctic Bottom Water flows with a northward component through 30 degrees S west of the Rio Grande Rise, but southward transport in the upper part of the AABW across 30 degrees S. The implications of reduced northward transport through the Hunter Channel on the heat budget suggest less diapycnal mixing across the warmer AABW classes.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Oceanography
Una Kim Miller, Christopher J. Zappa, Seth F. Zippel, J. Thomas Farrar, Robert A. Weller
Summary: This study presents estimates of turbulence kinetic energy dissipation rate obtained using acoustic Doppler current profilers (ADCPs) in the Southeast Pacific Ocean. The results suggest that the new method is consistent with other parameterizations and can be used to understand the transfer of heat and other properties between the ocean and atmosphere.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
