Variability of the Pacific‐derived Arctic water over the southeastern Wandel Sea shelf (Northeast Greenland) in 2015‐2016

Igor A. Dmitrenko*, Sergei A. Kirillov, Bert Rudels, David G. Babb, Paul G. Myers, Colin A. Stedmon, Jørgen Bendtsen, Jens K. Ehn, Leif Toudal Pedersen, Søren Rysgaard, David G. Barber

*Corresponding author for this work

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Abstract

A portion of the freshwater transport through Fram Strait consists of low‐salinity Pacific‐derived Arctic water flowing southward along the east coast of Greenland. The pathways of this water are currently unclear. An Ice Tethered Profiler deployed over the southeastern Wandel Sea shelf (northeast Greenland) in May 2015 collected a profile every 3 hr for a year recording conductivity‐temperature‐depth (CTD) and Colored Dissolved Organic Matter (CDOM) fluorescence.

This was accompanied by velocity observations. The CTD data revealed that the subsurface water (~15–85 m depth) characterized by high CDOM resembles the “cold Halostad” in the Canada Basin formed by the injection of Pacific water. A coastal branch of the Pacific water outflow from the Arctic Ocean supplies the Wandel Sea halostad, which shows a clear seasonal pattern.

From July to October–November, the halostad is shallow, more saline, warmer, and with less CDOM. Conversely, from November to April, the halostad deepens, cools, freshens and CDOM increases, likely indicating a higher fraction of Pacific winter water. The CTD surveys, wind and current data, and numerical simulations show that the seasonal variation of wind over the continental slope likely controls seasonal changes of this intermediate water layer.

Over northeast Greenland, winter winds have a northerly component from November to April, favoring Ekman transport of the Pacific‐derived water to the Wandel Sea shelf. In contrast, the prevailing southerly summer winds result in retreat of the Pacific‐derived water off the shelf. The landfast ice off‐slope extension modifies wind‐forcing disrupting seasonal patterns
Original languageEnglish
JournalJournal of Geophysical Research
Volume124
Issue number1
Pages (from-to)349-373
ISSN2169-9275
DOIs
Publication statusPublished - 2019

Keywords

  • Tracers
  • Colored dissolved organic matter
  • Wind forcing
  • Wandel Sea shelf
  • Seasonal variability
  • Pacific water

Cite this

Dmitrenko, Igor A. ; Kirillov, Sergei A. ; Rudels, Bert ; Babb, David G. ; Myers, Paul G. ; Stedmon, Colin A. ; Bendtsen, Jørgen ; Ehn, Jens K. ; Pedersen, Leif Toudal ; Rysgaard, Søren ; Barber, David G. / Variability of the Pacific‐derived Arctic water over the southeastern Wandel Sea shelf (Northeast Greenland) in 2015‐2016. In: Journal of Geophysical Research. 2019 ; Vol. 124, No. 1. pp. 349-373.
@article{0452ca7b5f624ba3bbe2d0eab7418a62,
title = "Variability of the Pacific‐derived Arctic water over the southeastern Wandel Sea shelf (Northeast Greenland) in 2015‐2016",
abstract = "A portion of the freshwater transport through Fram Strait consists of low‐salinity Pacific‐derived Arctic water flowing southward along the east coast of Greenland. The pathways of this water are currently unclear. An Ice Tethered Profiler deployed over the southeastern Wandel Sea shelf (northeast Greenland) in May 2015 collected a profile every 3 hr for a year recording conductivity‐temperature‐depth (CTD) and Colored Dissolved Organic Matter (CDOM) fluorescence.This was accompanied by velocity observations. The CTD data revealed that the subsurface water (~15–85 m depth) characterized by high CDOM resembles the “cold Halostad” in the Canada Basin formed by the injection of Pacific water. A coastal branch of the Pacific water outflow from the Arctic Ocean supplies the Wandel Sea halostad, which shows a clear seasonal pattern.From July to October–November, the halostad is shallow, more saline, warmer, and with less CDOM. Conversely, from November to April, the halostad deepens, cools, freshens and CDOM increases, likely indicating a higher fraction of Pacific winter water. The CTD surveys, wind and current data, and numerical simulations show that the seasonal variation of wind over the continental slope likely controls seasonal changes of this intermediate water layer.Over northeast Greenland, winter winds have a northerly component from November to April, favoring Ekman transport of the Pacific‐derived water to the Wandel Sea shelf. In contrast, the prevailing southerly summer winds result in retreat of the Pacific‐derived water off the shelf. The landfast ice off‐slope extension modifies wind‐forcing disrupting seasonal patterns",
keywords = "Tracers, Colored dissolved organic matter, Wind forcing, Wandel Sea shelf, Seasonal variability, Pacific water",
author = "Dmitrenko, {Igor A.} and Kirillov, {Sergei A.} and Bert Rudels and Babb, {David G.} and Myers, {Paul G.} and Stedmon, {Colin A.} and J{\o}rgen Bendtsen and Ehn, {Jens K.} and Pedersen, {Leif Toudal} and S{\o}ren Rysgaard and Barber, {David G.}",
year = "2019",
doi = "10.1029/2018JC014567",
language = "English",
volume = "124",
pages = "349--373",
journal = "Journal of Geophysical Research",
issn = "0148-0227",
publisher = "American Geophysical Union",
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Dmitrenko, IA, Kirillov, SA, Rudels, B, Babb, DG, Myers, PG, Stedmon, CA, Bendtsen, J, Ehn, JK, Pedersen, LT, Rysgaard, S & Barber, DG 2019, 'Variability of the Pacific‐derived Arctic water over the southeastern Wandel Sea shelf (Northeast Greenland) in 2015‐2016', Journal of Geophysical Research, vol. 124, no. 1, pp. 349-373. https://doi.org/10.1029/2018JC014567

Variability of the Pacific‐derived Arctic water over the southeastern Wandel Sea shelf (Northeast Greenland) in 2015‐2016. / Dmitrenko, Igor A.; Kirillov, Sergei A.; Rudels, Bert; Babb, David G.; Myers, Paul G. ; Stedmon, Colin A.; Bendtsen, Jørgen ; Ehn, Jens K.; Pedersen, Leif Toudal; Rysgaard, Søren; Barber, David G.

In: Journal of Geophysical Research, Vol. 124, No. 1, 2019, p. 349-373.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Variability of the Pacific‐derived Arctic water over the southeastern Wandel Sea shelf (Northeast Greenland) in 2015‐2016

AU - Dmitrenko, Igor A.

AU - Kirillov, Sergei A.

AU - Rudels, Bert

AU - Babb, David G.

AU - Myers, Paul G.

AU - Stedmon, Colin A.

AU - Bendtsen, Jørgen

AU - Ehn, Jens K.

AU - Pedersen, Leif Toudal

AU - Rysgaard, Søren

AU - Barber, David G.

PY - 2019

Y1 - 2019

N2 - A portion of the freshwater transport through Fram Strait consists of low‐salinity Pacific‐derived Arctic water flowing southward along the east coast of Greenland. The pathways of this water are currently unclear. An Ice Tethered Profiler deployed over the southeastern Wandel Sea shelf (northeast Greenland) in May 2015 collected a profile every 3 hr for a year recording conductivity‐temperature‐depth (CTD) and Colored Dissolved Organic Matter (CDOM) fluorescence.This was accompanied by velocity observations. The CTD data revealed that the subsurface water (~15–85 m depth) characterized by high CDOM resembles the “cold Halostad” in the Canada Basin formed by the injection of Pacific water. A coastal branch of the Pacific water outflow from the Arctic Ocean supplies the Wandel Sea halostad, which shows a clear seasonal pattern.From July to October–November, the halostad is shallow, more saline, warmer, and with less CDOM. Conversely, from November to April, the halostad deepens, cools, freshens and CDOM increases, likely indicating a higher fraction of Pacific winter water. The CTD surveys, wind and current data, and numerical simulations show that the seasonal variation of wind over the continental slope likely controls seasonal changes of this intermediate water layer.Over northeast Greenland, winter winds have a northerly component from November to April, favoring Ekman transport of the Pacific‐derived water to the Wandel Sea shelf. In contrast, the prevailing southerly summer winds result in retreat of the Pacific‐derived water off the shelf. The landfast ice off‐slope extension modifies wind‐forcing disrupting seasonal patterns

AB - A portion of the freshwater transport through Fram Strait consists of low‐salinity Pacific‐derived Arctic water flowing southward along the east coast of Greenland. The pathways of this water are currently unclear. An Ice Tethered Profiler deployed over the southeastern Wandel Sea shelf (northeast Greenland) in May 2015 collected a profile every 3 hr for a year recording conductivity‐temperature‐depth (CTD) and Colored Dissolved Organic Matter (CDOM) fluorescence.This was accompanied by velocity observations. The CTD data revealed that the subsurface water (~15–85 m depth) characterized by high CDOM resembles the “cold Halostad” in the Canada Basin formed by the injection of Pacific water. A coastal branch of the Pacific water outflow from the Arctic Ocean supplies the Wandel Sea halostad, which shows a clear seasonal pattern.From July to October–November, the halostad is shallow, more saline, warmer, and with less CDOM. Conversely, from November to April, the halostad deepens, cools, freshens and CDOM increases, likely indicating a higher fraction of Pacific winter water. The CTD surveys, wind and current data, and numerical simulations show that the seasonal variation of wind over the continental slope likely controls seasonal changes of this intermediate water layer.Over northeast Greenland, winter winds have a northerly component from November to April, favoring Ekman transport of the Pacific‐derived water to the Wandel Sea shelf. In contrast, the prevailing southerly summer winds result in retreat of the Pacific‐derived water off the shelf. The landfast ice off‐slope extension modifies wind‐forcing disrupting seasonal patterns

KW - Tracers

KW - Colored dissolved organic matter

KW - Wind forcing

KW - Wandel Sea shelf

KW - Seasonal variability

KW - Pacific water

U2 - 10.1029/2018JC014567

DO - 10.1029/2018JC014567

M3 - Journal article

VL - 124

SP - 349

EP - 373

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

IS - 1

ER -