Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Delayed Collapse of the North Pacific Intermediate Water After the Glacial Termination

Zhao, Debo ; Wan, Shiming ; Lu, Zhengyao LU ; Zhai, Lina ; Feng, Xuguang ; Shi, Xuefa and Li, Anchun (2021) In Geophysical Research Letters 48(13).
Abstract

Carbon release from the North Pacific in glacial-interglacial cycles has been mainly linked to the North Pacific Intermediate Water (NPIW) formation and associated carbon/nutrient water upwelling and biological productivity changes. However, relationship between NPIW and atmospheric CO2 change in the early interglacial remains unclear. Here we report a high-resolution sediment record of NPIW evolution based on paleo-redox changes in the Western North Pacific during the last 400 ka. Our proxy and model results reveal a delayed collapse of NPIW after the glacial termination was coeval with decreased salinity of intermediate water and increased net rainfall in the North Pacific. Such weakened NPIW formation in the North Pacific... (More)

Carbon release from the North Pacific in glacial-interglacial cycles has been mainly linked to the North Pacific Intermediate Water (NPIW) formation and associated carbon/nutrient water upwelling and biological productivity changes. However, relationship between NPIW and atmospheric CO2 change in the early interglacial remains unclear. Here we report a high-resolution sediment record of NPIW evolution based on paleo-redox changes in the Western North Pacific during the last 400 ka. Our proxy and model results reveal a delayed collapse of NPIW after the glacial termination was coeval with decreased salinity of intermediate water and increased net rainfall in the North Pacific. Such weakened NPIW formation in the North Pacific probably make a contribution to maintain high atmospheric CO2 concentrations through weakened intermediate-to-deep ocean stratification and reduced subsurface biological pump net efficiency, countering the return to more stratified conditions in the Southern Ocean, which should drive down atmospheric CO2 during the early interglacial.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
marine sediment, NPIW, Okinawa Trough, redox environment, trace elements
in
Geophysical Research Letters
volume
48
issue
13
article number
e2021GL092911
publisher
American Geophysical Union (AGU)
external identifiers
  • scopus:85109752590
ISSN
0094-8276
DOI
10.1029/2021GL092911
language
English
LU publication?
yes
id
efeb7148-c74b-4d1a-a53b-9b72a54829df
date added to LUP
2021-12-23 14:50:43
date last changed
2022-04-27 06:55:15
@article{efeb7148-c74b-4d1a-a53b-9b72a54829df,
  abstract     = {{<p>Carbon release from the North Pacific in glacial-interglacial cycles has been mainly linked to the North Pacific Intermediate Water (NPIW) formation and associated carbon/nutrient water upwelling and biological productivity changes. However, relationship between NPIW and atmospheric CO<sub>2</sub> change in the early interglacial remains unclear. Here we report a high-resolution sediment record of NPIW evolution based on paleo-redox changes in the Western North Pacific during the last 400 ka. Our proxy and model results reveal a delayed collapse of NPIW after the glacial termination was coeval with decreased salinity of intermediate water and increased net rainfall in the North Pacific. Such weakened NPIW formation in the North Pacific probably make a contribution to maintain high atmospheric CO<sub>2</sub> concentrations through weakened intermediate-to-deep ocean stratification and reduced subsurface biological pump net efficiency, countering the return to more stratified conditions in the Southern Ocean, which should drive down atmospheric CO<sub>2</sub> during the early interglacial.</p>}},
  author       = {{Zhao, Debo and Wan, Shiming and Lu, Zhengyao and Zhai, Lina and Feng, Xuguang and Shi, Xuefa and Li, Anchun}},
  issn         = {{0094-8276}},
  keywords     = {{marine sediment; NPIW; Okinawa Trough; redox environment; trace elements}},
  language     = {{eng}},
  number       = {{13}},
  publisher    = {{American Geophysical Union (AGU)}},
  series       = {{Geophysical Research Letters}},
  title        = {{Delayed Collapse of the North Pacific Intermediate Water After the Glacial Termination}},
  url          = {{http://dx.doi.org/10.1029/2021GL092911}},
  doi          = {{10.1029/2021GL092911}},
  volume       = {{48}},
  year         = {{2021}},
}