Source waters for the highly productive Patagonian shelf in the southwestern Atlantic

Hajoon Song, John Marshall, Michael J. Follows, Stephanie Dutkiewicz, Gaël Forget

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Possible nutrient sources and delivery mechanisms for the highly productive Patagonian shelf in the southwest Atlantic are identified. Using a passive tracer adjoint sensitivity experiment, we identify three source waters: waters local to the Patagonian shelf, coastal waters near the Chilean coast and the subsurface waters in the southeast Pacific. We perform a series of forward simulations of a biogeochemical model to investigate the impact of nutrient perturbations in these source regions to productivity on the Patagonian shelf.Positive nitrate perturbations from local waters have an immediate impact elevating productivity. Iron perturbations local to the shelf, however, do not change productivity because the shelf region is limited by nitrate. Additional nutrient supply from the other source regions leads to increases in productivity. We find that positive nutrient perturbations in subsurface waters in the southeast Pacific result in the largest boost of productivity over the shelf. These source waters are rich in nutrients and upwelled from the depth where light levels are so low that they cannot be consumed. Finally, we identify wintertime intense vertical mixing as the key process which draws nutrients from below 300-500 m to the surface before being delivered to the shelf.

Original languageEnglish
Pages (from-to)120-128
Number of pages9
JournalJournal of Marine Systems
Volume158
DOIs
Publication statusPublished - 2016 Jun 1

Fingerprint

nutrient
nutrients
productivity
perturbation
water
nitrates
nitrate
vertical mixing
coastal water
tracer techniques
tracer
iron
coasts
coast
simulation
experiment

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

Cite this

Song, Hajoon ; Marshall, John ; Follows, Michael J. ; Dutkiewicz, Stephanie ; Forget, Gaël. / Source waters for the highly productive Patagonian shelf in the southwestern Atlantic. In: Journal of Marine Systems. 2016 ; Vol. 158. pp. 120-128.
@article{69b4f04e1002461582bf653a1d46ab57,
title = "Source waters for the highly productive Patagonian shelf in the southwestern Atlantic",
abstract = "Possible nutrient sources and delivery mechanisms for the highly productive Patagonian shelf in the southwest Atlantic are identified. Using a passive tracer adjoint sensitivity experiment, we identify three source waters: waters local to the Patagonian shelf, coastal waters near the Chilean coast and the subsurface waters in the southeast Pacific. We perform a series of forward simulations of a biogeochemical model to investigate the impact of nutrient perturbations in these source regions to productivity on the Patagonian shelf.Positive nitrate perturbations from local waters have an immediate impact elevating productivity. Iron perturbations local to the shelf, however, do not change productivity because the shelf region is limited by nitrate. Additional nutrient supply from the other source regions leads to increases in productivity. We find that positive nutrient perturbations in subsurface waters in the southeast Pacific result in the largest boost of productivity over the shelf. These source waters are rich in nutrients and upwelled from the depth where light levels are so low that they cannot be consumed. Finally, we identify wintertime intense vertical mixing as the key process which draws nutrients from below 300-500 m to the surface before being delivered to the shelf.",
author = "Hajoon Song and John Marshall and Follows, {Michael J.} and Stephanie Dutkiewicz and Ga{\"e}l Forget",
year = "2016",
month = "6",
day = "1",
doi = "10.1016/j.jmarsys.2016.02.009",
language = "English",
volume = "158",
pages = "120--128",
journal = "Journal of Marine Systems",
issn = "0924-7963",
publisher = "Elsevier",

}

Source waters for the highly productive Patagonian shelf in the southwestern Atlantic. / Song, Hajoon; Marshall, John; Follows, Michael J.; Dutkiewicz, Stephanie; Forget, Gaël.

In: Journal of Marine Systems, Vol. 158, 01.06.2016, p. 120-128.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Source waters for the highly productive Patagonian shelf in the southwestern Atlantic

AU - Song, Hajoon

AU - Marshall, John

AU - Follows, Michael J.

AU - Dutkiewicz, Stephanie

AU - Forget, Gaël

PY - 2016/6/1

Y1 - 2016/6/1

N2 - Possible nutrient sources and delivery mechanisms for the highly productive Patagonian shelf in the southwest Atlantic are identified. Using a passive tracer adjoint sensitivity experiment, we identify three source waters: waters local to the Patagonian shelf, coastal waters near the Chilean coast and the subsurface waters in the southeast Pacific. We perform a series of forward simulations of a biogeochemical model to investigate the impact of nutrient perturbations in these source regions to productivity on the Patagonian shelf.Positive nitrate perturbations from local waters have an immediate impact elevating productivity. Iron perturbations local to the shelf, however, do not change productivity because the shelf region is limited by nitrate. Additional nutrient supply from the other source regions leads to increases in productivity. We find that positive nutrient perturbations in subsurface waters in the southeast Pacific result in the largest boost of productivity over the shelf. These source waters are rich in nutrients and upwelled from the depth where light levels are so low that they cannot be consumed. Finally, we identify wintertime intense vertical mixing as the key process which draws nutrients from below 300-500 m to the surface before being delivered to the shelf.

AB - Possible nutrient sources and delivery mechanisms for the highly productive Patagonian shelf in the southwest Atlantic are identified. Using a passive tracer adjoint sensitivity experiment, we identify three source waters: waters local to the Patagonian shelf, coastal waters near the Chilean coast and the subsurface waters in the southeast Pacific. We perform a series of forward simulations of a biogeochemical model to investigate the impact of nutrient perturbations in these source regions to productivity on the Patagonian shelf.Positive nitrate perturbations from local waters have an immediate impact elevating productivity. Iron perturbations local to the shelf, however, do not change productivity because the shelf region is limited by nitrate. Additional nutrient supply from the other source regions leads to increases in productivity. We find that positive nutrient perturbations in subsurface waters in the southeast Pacific result in the largest boost of productivity over the shelf. These source waters are rich in nutrients and upwelled from the depth where light levels are so low that they cannot be consumed. Finally, we identify wintertime intense vertical mixing as the key process which draws nutrients from below 300-500 m to the surface before being delivered to the shelf.

UR - http://www.scopus.com/inward/record.url?scp=84960385934&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84960385934&partnerID=8YFLogxK

U2 - 10.1016/j.jmarsys.2016.02.009

DO - 10.1016/j.jmarsys.2016.02.009

M3 - Article

AN - SCOPUS:84960385934

VL - 158

SP - 120

EP - 128

JO - Journal of Marine Systems

JF - Journal of Marine Systems

SN - 0924-7963

ER -