Net community production in the northeastern Chukchi Sea

Jeremy T. Mathis, Nicholas R. Bates, Dennis A Hansell, Tali Babila

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

To assess the magnitude, distribution and fate of net community production (NCP) in the Chukchi Sea, dissolved inorganic carbon (DIC), dissolved organic carbon (DOC) and dissolved organic nitrogen (DON), and particulate organic carbon (POC) and particulate organic nitrogen (PON) were measured during the spring and summer of 2004 and compared to similar observations taken in 2002. Distinctive differences in hydrographic conditions were observed between these two years, allowing us to consider several factors that could impact NCP and carbon cycling in both the Chukchi Shelf and the adjacent Canada Basin. Between the spring and summer cruises high rates of phytoplankton production over the Chukchi shelf resulted in a significant drawdown of DIC in the mixed layer and the associated production of DOC/N and POC/N. As in 2002, the highest rates of NCP occurred over the northeastern part of the Chukchi shelf near the head of Barrow Canyon, which has historically been a hotspot for biological activity in the region. However, in 2004, rates of NCP over most of the northeastern shelf were similar and in some cases higher than rates observed in 2002. This was unexpected due to a greater influence of low-nutrient waters from the Alaskan Coastal Current in 2004, which should have suppressed rates of NCP compared to 2002. Between spring and summer of 2004, normalized concentrations of DIC in the mixed layer decreased by as much as 280 μmol kg-1, while DOC and DON increased by ∼16 and 9 μmol kg-1, respectively. Given the decreased availability of inorganic nutrients in 2004, rates of NCP could be attributed to increased light penetration, which may have allowed phytoplankton to increase utilization of nutrients deeper in the water column. In addition, there was a rapid and extensive retreat of the ice cover in summer 2004 with warmer temperatures in the mixed layer that could have enhanced NCP. Estimates of NCP near the head of Barrow Canyon in 2004 were ∼1500 mg carbon (C) m-2 d-1 which was ∼400 mg C m-2 d-1 higher than the same location in 2002. Estimates of NCP over the shelf-break and deep Canada Basin were low in both years, confirming that there is little primary production in the interior of the western Arctic Ocean due to near-zero concentrations of inorganic nitrate in the mixed layer.

Original languageEnglish (US)
Pages (from-to)1213-1222
Number of pages10
JournalDeep-Sea Research Part II: Topical Studies in Oceanography
Volume56
Issue number17
DOIs
StatePublished - Aug 1 2009

Fingerprint

mixed layer
dissolved inorganic carbon
dissolved organic carbon
dissolved organic nitrogen
particulate organic carbon
summer
canyon
nutrient
phytoplankton
particulate organic nitrogen
coastal current
carbon
shelf break
drawdown
ice cover
basin
sea
rate
primary production
penetration

Keywords

  • Arctic
  • Carbon
  • Chukchi Sea
  • Net community production

ASJC Scopus subject areas

  • Oceanography

Cite this

Net community production in the northeastern Chukchi Sea. / Mathis, Jeremy T.; Bates, Nicholas R.; Hansell, Dennis A; Babila, Tali.

In: Deep-Sea Research Part II: Topical Studies in Oceanography, Vol. 56, No. 17, 01.08.2009, p. 1213-1222.

Research output: Contribution to journalArticle

Mathis, Jeremy T. ; Bates, Nicholas R. ; Hansell, Dennis A ; Babila, Tali. / Net community production in the northeastern Chukchi Sea. In: Deep-Sea Research Part II: Topical Studies in Oceanography. 2009 ; Vol. 56, No. 17. pp. 1213-1222.
@article{291333dd320e4b82a7f6ef79f130bb97,
title = "Net community production in the northeastern Chukchi Sea",
abstract = "To assess the magnitude, distribution and fate of net community production (NCP) in the Chukchi Sea, dissolved inorganic carbon (DIC), dissolved organic carbon (DOC) and dissolved organic nitrogen (DON), and particulate organic carbon (POC) and particulate organic nitrogen (PON) were measured during the spring and summer of 2004 and compared to similar observations taken in 2002. Distinctive differences in hydrographic conditions were observed between these two years, allowing us to consider several factors that could impact NCP and carbon cycling in both the Chukchi Shelf and the adjacent Canada Basin. Between the spring and summer cruises high rates of phytoplankton production over the Chukchi shelf resulted in a significant drawdown of DIC in the mixed layer and the associated production of DOC/N and POC/N. As in 2002, the highest rates of NCP occurred over the northeastern part of the Chukchi shelf near the head of Barrow Canyon, which has historically been a hotspot for biological activity in the region. However, in 2004, rates of NCP over most of the northeastern shelf were similar and in some cases higher than rates observed in 2002. This was unexpected due to a greater influence of low-nutrient waters from the Alaskan Coastal Current in 2004, which should have suppressed rates of NCP compared to 2002. Between spring and summer of 2004, normalized concentrations of DIC in the mixed layer decreased by as much as 280 μmol kg-1, while DOC and DON increased by ∼16 and 9 μmol kg-1, respectively. Given the decreased availability of inorganic nutrients in 2004, rates of NCP could be attributed to increased light penetration, which may have allowed phytoplankton to increase utilization of nutrients deeper in the water column. In addition, there was a rapid and extensive retreat of the ice cover in summer 2004 with warmer temperatures in the mixed layer that could have enhanced NCP. Estimates of NCP near the head of Barrow Canyon in 2004 were ∼1500 mg carbon (C) m-2 d-1 which was ∼400 mg C m-2 d-1 higher than the same location in 2002. Estimates of NCP over the shelf-break and deep Canada Basin were low in both years, confirming that there is little primary production in the interior of the western Arctic Ocean due to near-zero concentrations of inorganic nitrate in the mixed layer.",
keywords = "Arctic, Carbon, Chukchi Sea, Net community production",
author = "Mathis, {Jeremy T.} and Bates, {Nicholas R.} and Hansell, {Dennis A} and Tali Babila",
year = "2009",
month = "8",
day = "1",
doi = "10.1016/j.dsr2.2008.10.017",
language = "English (US)",
volume = "56",
pages = "1213--1222",
journal = "Deep-Sea Research Part II: Topical Studies in Oceanography",
issn = "0967-0645",
publisher = "Elsevier Limited",
number = "17",

}

TY - JOUR

T1 - Net community production in the northeastern Chukchi Sea

AU - Mathis, Jeremy T.

AU - Bates, Nicholas R.

AU - Hansell, Dennis A

AU - Babila, Tali

PY - 2009/8/1

Y1 - 2009/8/1

N2 - To assess the magnitude, distribution and fate of net community production (NCP) in the Chukchi Sea, dissolved inorganic carbon (DIC), dissolved organic carbon (DOC) and dissolved organic nitrogen (DON), and particulate organic carbon (POC) and particulate organic nitrogen (PON) were measured during the spring and summer of 2004 and compared to similar observations taken in 2002. Distinctive differences in hydrographic conditions were observed between these two years, allowing us to consider several factors that could impact NCP and carbon cycling in both the Chukchi Shelf and the adjacent Canada Basin. Between the spring and summer cruises high rates of phytoplankton production over the Chukchi shelf resulted in a significant drawdown of DIC in the mixed layer and the associated production of DOC/N and POC/N. As in 2002, the highest rates of NCP occurred over the northeastern part of the Chukchi shelf near the head of Barrow Canyon, which has historically been a hotspot for biological activity in the region. However, in 2004, rates of NCP over most of the northeastern shelf were similar and in some cases higher than rates observed in 2002. This was unexpected due to a greater influence of low-nutrient waters from the Alaskan Coastal Current in 2004, which should have suppressed rates of NCP compared to 2002. Between spring and summer of 2004, normalized concentrations of DIC in the mixed layer decreased by as much as 280 μmol kg-1, while DOC and DON increased by ∼16 and 9 μmol kg-1, respectively. Given the decreased availability of inorganic nutrients in 2004, rates of NCP could be attributed to increased light penetration, which may have allowed phytoplankton to increase utilization of nutrients deeper in the water column. In addition, there was a rapid and extensive retreat of the ice cover in summer 2004 with warmer temperatures in the mixed layer that could have enhanced NCP. Estimates of NCP near the head of Barrow Canyon in 2004 were ∼1500 mg carbon (C) m-2 d-1 which was ∼400 mg C m-2 d-1 higher than the same location in 2002. Estimates of NCP over the shelf-break and deep Canada Basin were low in both years, confirming that there is little primary production in the interior of the western Arctic Ocean due to near-zero concentrations of inorganic nitrate in the mixed layer.

AB - To assess the magnitude, distribution and fate of net community production (NCP) in the Chukchi Sea, dissolved inorganic carbon (DIC), dissolved organic carbon (DOC) and dissolved organic nitrogen (DON), and particulate organic carbon (POC) and particulate organic nitrogen (PON) were measured during the spring and summer of 2004 and compared to similar observations taken in 2002. Distinctive differences in hydrographic conditions were observed between these two years, allowing us to consider several factors that could impact NCP and carbon cycling in both the Chukchi Shelf and the adjacent Canada Basin. Between the spring and summer cruises high rates of phytoplankton production over the Chukchi shelf resulted in a significant drawdown of DIC in the mixed layer and the associated production of DOC/N and POC/N. As in 2002, the highest rates of NCP occurred over the northeastern part of the Chukchi shelf near the head of Barrow Canyon, which has historically been a hotspot for biological activity in the region. However, in 2004, rates of NCP over most of the northeastern shelf were similar and in some cases higher than rates observed in 2002. This was unexpected due to a greater influence of low-nutrient waters from the Alaskan Coastal Current in 2004, which should have suppressed rates of NCP compared to 2002. Between spring and summer of 2004, normalized concentrations of DIC in the mixed layer decreased by as much as 280 μmol kg-1, while DOC and DON increased by ∼16 and 9 μmol kg-1, respectively. Given the decreased availability of inorganic nutrients in 2004, rates of NCP could be attributed to increased light penetration, which may have allowed phytoplankton to increase utilization of nutrients deeper in the water column. In addition, there was a rapid and extensive retreat of the ice cover in summer 2004 with warmer temperatures in the mixed layer that could have enhanced NCP. Estimates of NCP near the head of Barrow Canyon in 2004 were ∼1500 mg carbon (C) m-2 d-1 which was ∼400 mg C m-2 d-1 higher than the same location in 2002. Estimates of NCP over the shelf-break and deep Canada Basin were low in both years, confirming that there is little primary production in the interior of the western Arctic Ocean due to near-zero concentrations of inorganic nitrate in the mixed layer.

KW - Arctic

KW - Carbon

KW - Chukchi Sea

KW - Net community production

UR - http://www.scopus.com/inward/record.url?scp=67649610617&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=67649610617&partnerID=8YFLogxK

U2 - 10.1016/j.dsr2.2008.10.017

DO - 10.1016/j.dsr2.2008.10.017

M3 - Article

AN - SCOPUS:67649610617

VL - 56

SP - 1213

EP - 1222

JO - Deep-Sea Research Part II: Topical Studies in Oceanography

JF - Deep-Sea Research Part II: Topical Studies in Oceanography

SN - 0967-0645

IS - 17

ER -