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  •  26 August 2021
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Dissolved Organic Matter Dynamics in the Epipelagic Northwest Pacific Low‐Latitude Western Boundary Current System: Insights From Optical Analyses

  •  17 August 2021

Key Points

  • In the tropical Northwest Pacific, DOM dynamics was jointly regulated by physical processes, phytoplankton production, photochemical reactions and microbial processes

  • In the tropical Northwest Pacific, organic matter fluorescence effectively traces frontal mixing processes

  • The quasi-permanent cold Mindanao and warm Halmahera eddy pair enhanced lateral dissolved organic matter transport in the western boundary current system

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Spatial and Temporal Variability of the Gulf Stream Near Cape Hatteras

  •  17 August 2021

Key Points

  • At Cape Hatteras, the nature of Gulf Stream position and transport variability changes over a 60-km distance from a red to a blue spectrum

  • Wave-like Gulf Stream meanders decay approaching Cape Hatteras with temporal amplitude variability that may be driven by the Loop Current

  • Florida Current transport maxima, coherent along the South Atlantic Bight, precede offshore Gulf Stream shifts downstream of Cape Hatteras

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Moored Observations of the Iceland‐Scotland Overflow Plume Along the Eastern Flank of the Reykjanes Ridge

  •  13 August 2021

Key Points

  • Dense waters overflowing the Iceland-Scotland ridge nearly double their volume transport through entrainment of lighter ambient waters

  • The export of the Iceland-Scotland Overflow Water from the Iceland Basin is approximately 5.3 Sv net of interior recirculation

  • The transport of the Iceland-Scotland Overflow plume found in this study is larger than most previously published estimates

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Biological Response to the Interaction of a Mesoscale Eddy and the River Plume in the Northern South China Sea

  •  12 August 2021

Key Points

  • An anomalous phytoplankton bloom occurred in the slope region under the influence of a mesoscale eddy and the Pearl River Plume

  • The nutrients supporting the bloom were not directly sourced from the Pearl River but were injected locally from subsurface

  • The interaction of freshwater from the Pearl River and eddy edge enhances frontal dynamics facilitating nutrient transport

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Environmental Regulation of the Nitrogen Supply, Mean Trophic Position, and Trophic Enrichment of Mesozooplankton in the Mekong River Plume and Southern South China Sea

  •  11 August 2021

Key Points

  • Trophic structure of mesozooplankton is regulated by similar environmental factors such as phytoplankton assemblages

  • Diazotrophy and nutrient availability correlated with enhanced mesozooplankton carnivory in a complex tropical marine ecosystem

  • Mass and energy transfer across trophic levels of planktonic food webs are less efficient in spatially and temporally variable ecosystems

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Predicting Dominance of Sand Transport by Waves, Tides, and Their Interactions on Sandy Continental Shelves

  •  9 August 2021

Key Points

  • Dominant forcing mode and magnitude of net sand transport are predictable from readily available data using a k-Nearest Neighbor algorithm

  • Sand waves increase in length and asymmetry, and decrease in height, for increasing wave-dominance under extreme conditions

  • Over an average year, meso-macrotidal areas are tide-dominated, while shallow, finer grained, microtidal regions are wave-dominated

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Revisiting the Ocean Color Algorithms for Particulate Organic Carbon and Chlorophyll‐a Concentrations in the Ross Sea

  •  9 August 2021

Key Points

  • Both Chlorophyll-a (Chl) and particulate organic carbon (POC) in the Ross Sea are markedly underestimated using the NASA standard algorithms

  • Rrs667-based algorithms are locally tuned for the Ross Sea, with significantly improved performances in retrieving Chl and POC

  • The algal bloom signals in the Ross Sea are significantly higher than previously determined

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Winter Dynamics in an Epishelf Lake: Quantitative Mixing Estimates and Ice Shelf Basal Channel Considerations

  •  7 August 2021

Key Points

  • A one-dimensional model is used to analyze 8 years of winter mooring data of the upper water column in a perennially ice-covered fjord

  • Mixing is more pronounced in the isolated freshwater layer (epishelf lake) than in the seawater below

  • Epishelf lake water exits the fjord through a basal channel under the ice shelf. The channel is apparently not evolving rapidly

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Denitrification and Anammox Shift Nutrient Stoichiometry and the Phytoplankton Community Structure in the Benguela Upwelling System

  •  6 August 2021

Key Points

  • Denitrification shifts nutrient stoichiometry and the phytoplankton community structure in the northern Benguela

  • Denitrification and anammox interact to limit growth of picophytoplankton, and favor a flagellate-dominated community structure and diatoms succession

  • The shift in nutrient stoichiometry and phytoplankton community structure from combined effects of denitrification and anammox result in a decrease in dissolved inorganic carbon uptake

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Hydrate Formation on Marine Seep Bubbles and the Implications for Water Column Methane Dissolution

  •  1 September 2021

Key Points

  • In deepwater marine environments, some methane bubbles emerging from the seafloor acquire gas hydrate shells before they release

  • Gas hydrate shells form when bubble release rates from seeps within the hydrate stability zone are slower than ∼5 seconds per bubble

  • Within 1.5 m of rise, most bubbles grow shells, with initially shelled bubbles having ∼5% more gas than initially clean bubbles

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Swell Generation under Extra‐Tropical Storms

  •  28 August 2021

Key Points

  • Wave generation by a moving extra-tropical storm is described using a Gaussian wind field and a parametric model of wave development

  • A new developed machine-learning algorithm triangulates the space-time evolving source point of swell systems from buoy measurements

  • This model describes the distance between swell source and the storm’s maximum wind speed and reveals sensitivities to storm’s parameters

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Turbulence properties of a deep‐sea hydrothermal plume in a time‐variable cross‐flow: field and model comparisons for Dante in the Main Endeavour Field

  •  27 August 2021

Key Points

  • Shear production of turbulent kinetic energy is balanced by dissipation

  • For thermal variance, the vertical transport and its flux divergence balance the dissipation

  • Hydrothermal discharge at the Dante sulfide mound modeled with a heat transport of 50 MW over a urn:x-wiley:21699275:media:jgrc24710:jgrc24710-math-0002 area is comparable to observations

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Wind driven variability in the Spitsbergen Polar Current and the Svalbard Branch across the Yermak Plateau

  •  26 August 2021

Key Points

  • Bottom geostrophic velocity anomaly in the SPC and the SB is calculated from ocean bottom pressure- and CTD measurements

  • Significant correlation is found between the wind stress curl over the northeastern Fram Strait and volume transport anomaly across the YP

  • More frequent winter-cyclones affecting Svalbard will increase the volume transport variability and pulses of warm water to the shelf areas north of Svalbard

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Dissolved Cd, Co, Cu, Fe, Mn, Ni and Zn in the Arctic Ocean

  •  26 August 2021

Key points

  • The transpolar drift is one of the major transport mechanisms of silicate, dissolved Cu, Fe, Mn and Ni into and through the Arctic Ocean

  • In the Makarov Basin, Pacific waters are a source of dissolved cadmium, copper, manganese and nickel, but not of iron

  • The longer residence time of waters in the Makarov basin result in a decrease of dissolved metal concentrations

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Changes in under‐ice primary production in the Chukchi Sea from 1988 to 2018

  •  26 August 2021

Key Points

  • The northern Chukchi Sea has been amenable to under-ice bloom formation since at least 1988

  • Under-ice blooms account for nearly half of total net primary production in the northern Chukchi Sea between 1988 and 2018

  • Variation in under-ice net primary production (NPP) was the most important driver in interannual changes in total annual NPP

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Niño 4 West (Niño‐4W) sea surface temperature variability

  •  26 August 2021

Key Points

  • Nino-4W SST variability, with high negative skewness, is a unique climate index in the western Pacific warm pool

  • Zonal advective feedback, or advection due to anomalous zonal current, plays a key role in driving SST variability in Nino-4W

  • Strong negative feedback from air-sea flux anomalies during the development of the warm events in Nino-4W contributes to the SST skewness

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WAVE TRANSFORMATION ON A FRINGING REEF SYSTEM WITH SPUR AND GROOVE STRUCTURES

  •  23 August 2021

Key Points

  • High dissipation and wave friction factor observed over spurs and grooves zone by field measurements

  • Wave energy flux dissipation by bottom friction up to three times higher over spur than over groove structures

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Volume and heat transport in the South China Sea and Maritime Continent at present and the end of the 21st century

  •  22 August 2021

Key points

  • South China Sea ocean transports are studied using a high-resolution regional ocean model and high-resolution global climate models

  • The seasonally varying intermediate and deep layer water mass in the SCS originates in the central Pacific Ocean

  • High-resolution global climate models predict pronounced changes in SCS transports in response to anthropogenic forcing

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Reciprocity in the Indian Ocean: Intraseasonal Oscillation and Ocean Planetary Waves

  •  22 August 2021

Key Points

  • Rossby waves in the tropical Indian Ocean increase ocean heat content prior to the intensification of intraseasonal oscillation convection

  • The increase of ocean heat content is mainly due to ocean dynamics including vertical and meridional advection

  • The oceanic Rossby waves link successive atmospheric intraseasonal oscillations

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EN4: Quality controlled ocean temperature and salinity profiles and monthly objective analyses with uncertainty estimates

Key Points

  • EN4 dataset of quality-controlled temperature and salinity profiles is described
  • Dataset covers 1900 to present and includes monthly objective analyses
  • A novel method is presented to estimate uncertainty in the objective analyses

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Observation of rogue wave holes in a water wave tank

Key Points

  • Experimental generation of rogue wave holes
  • Rogue waves holes within the framework of the nonlinear Schrodinger equation
  • Rogue wave holes modeled by the Peregrine soliton

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A Global Perspective on Microplastics

Key Points

  • The sources, behavior, fate, and effects of microplastics are inexplicably tied to those of their plastic product and macrodebris precursors, as well as the nanoplastics into which they fragment
  • Microplastic sampling and characterization methods are evolving, but their inadequacies still hamper efforts to evaluate the true extent of their presence and consequences in the built and natural environments
  • Microplastics are a global/multimedia phenomenon; hence, they cannot be adequately understood, or related concerns resolved, in the context of the marine environment alone or a single discipline

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Seasonal and interannual variability of the Eastern Tropical Pacific Fresh Pool

Key Points

  • Satellite SSS in synergy with complementary EO data allows studying the seasonal and interannual dynamics of the Eastern Pacific Fresh Pool
  • Fresh pool zonal displacements and links between surface and subsurface processes respond to freshwater fluxes, wind stress, and currents
  • Fresh pool interannual variability is related to ENSO phases, a maximal extension was reached in 2015 coinciding with a strong El Nino event

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Enhanced sea‐air CO2 exchange influenced by a tropical depression in the South China Sea

Key Points

  • Surface water diluted by heavy rain had low pCO2,sw
  • Passage of a tropical depression led to high pCO2,sw by eddy-driven uplifting
  • The depression turned local water from a carbon sink to a source temporarily

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Role of Baroclinic Processes on Flushing Characteristics in a Highly Stratified Estuarine System, Mobile Bay, Alabama

Key Points

  • Baroclinic processes, particularly the density-driven circulation, are important in the flushing of the stratified estuary
  • Without the baroclinic processes, the flushing time can be overestimated by onefold under low to moderate river discharge conditions
  • This is the first study to summarize the full three-dimensional general circulation in Mobile Bay, whose pattern is primarily regulated by river discharge and modulated by wind forcing

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Understanding Arctic Ocean Circulation: A Review of Ocean Dynamics in a Changing Climate

Key Points

  • Major features of Arctic Ocean circulation are reviewed and interpreted theoretically
  • Fundamental ocean dynamics are set in the context of a changing Arctic climate
  • We describe how Arctic dynamics might change in the future

Plain Language Summary

The Arctic region is experiencing the most rapid environmental changes on Earth, with unparalleled air temperature increases, a warming ocean, and melting permafrost, snow, and ice. The ocean is a central control via Arctic Ocean warming, freshening, and circulation dynamics that link to the sea ice, atmosphere, and terrestrial environment. Given the rapid pace of Arctic change, it is vital to take stock of present understanding of the ocean circulation to address knowledge gaps and make viable future predictions. Present understanding of the principal geophysical fluid dynamics of Arctic Ocean circulation is synthesized here, and we speculate on how the dynamics of the ocean-ice-atmosphere system might change in a warming Arctic.

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