Twentieth-century warming revives the world's northernmost lake

Bianca B. Perren; Alexander P. Wolfe; Colin A. Cooke; Kurt H. Kjær; David Mazzucchi; Eric J. Steig

doi:10.1130/G33621.1

Twentieth-century warming revives the world's northernmost lake

Bianca B. Perren, Alexander P. Wolfe, Colin A. Cooke, Kurt H. Kjær, David Mazzucchi, Eric J. Steig

24 Citationer (Scopus)

Abstract

Although recent ecological changes are widespread in Arctic lakes, it remains unclear whether they are more strongly associated with climate warming or the deposition of reactive nitrogen (Nr) from anthropogenic sources. We developed a 3500-yr paleolimnological record from the world's northernmost lake to explore this question. Microfossils indicate that siliceous diatoms and chrysophytes were abundant initially, but disappeared 2400 yr ago in concert with Neoglacial cooling. Microfossils reappear in 20th-century sediments and reach unprecedented concentrations in sediments deposited after ca. A.D. 1980, tracking increasing summer temperatures in the absence of evidence for atmospheric nutrient subsidies. These results indicate that current warming in northern Greenland is unprecedented in the context of the past 2400 yr, and that climate change alone is responsible for the marked biological changes observed.

Originalsprog	Engelsk
Tidsskrift	Geology
Vol/bind	40
Udgave nummer	11
Sider (fra-til)	1003-1006
Antal sider	4
ISSN	0091-7613
DOI	https://doi.org/10.1130/G33621.1
Status	Udgivet - nov. 2012

Adgang til dokumentet

10.1130/G33621.1

Citationsformater

@article{33ea6abd4d4d403a88f08db3eaf34a46,

title = "Twentieth-century warming revives the world's northernmost lake",

abstract = "Although recent ecological changes are widespread in Arctic lakes, it remains unclear whether they are more strongly associated with climate warming or the deposition of reactive nitrogen (Nr) from anthropogenic sources. We developed a 3500-yr paleolimnological record from the world's northernmost lake to explore this question. Microfossils indicate that siliceous diatoms and chrysophytes were abundant initially, but disappeared 2400 yr ago in concert with Neoglacial cooling. Microfossils reappear in 20th-century sediments and reach unprecedented concentrations in sediments deposited after ca. A.D. 1980, tracking increasing summer temperatures in the absence of evidence for atmospheric nutrient subsidies. These results indicate that current warming in northern Greenland is unprecedented in the context of the past 2400 yr, and that climate change alone is responsible for the marked biological changes observed.",

author = "Perren, {Bianca B.} and Wolfe, {Alexander P.} and Cooke, {Colin A.} and Kj{\ae}r, {Kurt H.} and David Mazzucchi and Steig, {Eric J.}",

year = "2012",

month = nov,

doi = "10.1130/G33621.1",

language = "English",

volume = "40",

pages = "1003--1006",

journal = "Geology",

issn = "0091-7613",

publisher = "GeoScienceWorld",

number = "11",

}

TY - JOUR

T1 - Twentieth-century warming revives the world's northernmost lake

AU - Perren, Bianca B.

AU - Wolfe, Alexander P.

AU - Cooke, Colin A.

AU - Kjær, Kurt H.

AU - Mazzucchi, David

AU - Steig, Eric J.

PY - 2012/11

Y1 - 2012/11

N2 - Although recent ecological changes are widespread in Arctic lakes, it remains unclear whether they are more strongly associated with climate warming or the deposition of reactive nitrogen (Nr) from anthropogenic sources. We developed a 3500-yr paleolimnological record from the world's northernmost lake to explore this question. Microfossils indicate that siliceous diatoms and chrysophytes were abundant initially, but disappeared 2400 yr ago in concert with Neoglacial cooling. Microfossils reappear in 20th-century sediments and reach unprecedented concentrations in sediments deposited after ca. A.D. 1980, tracking increasing summer temperatures in the absence of evidence for atmospheric nutrient subsidies. These results indicate that current warming in northern Greenland is unprecedented in the context of the past 2400 yr, and that climate change alone is responsible for the marked biological changes observed.

AB - Although recent ecological changes are widespread in Arctic lakes, it remains unclear whether they are more strongly associated with climate warming or the deposition of reactive nitrogen (Nr) from anthropogenic sources. We developed a 3500-yr paleolimnological record from the world's northernmost lake to explore this question. Microfossils indicate that siliceous diatoms and chrysophytes were abundant initially, but disappeared 2400 yr ago in concert with Neoglacial cooling. Microfossils reappear in 20th-century sediments and reach unprecedented concentrations in sediments deposited after ca. A.D. 1980, tracking increasing summer temperatures in the absence of evidence for atmospheric nutrient subsidies. These results indicate that current warming in northern Greenland is unprecedented in the context of the past 2400 yr, and that climate change alone is responsible for the marked biological changes observed.

U2 - 10.1130/G33621.1

DO - 10.1130/G33621.1

M3 - Journal article

SN - 0091-7613

VL - 40

SP - 1003

EP - 1006

JO - Geology

JF - Geology

IS - 11

ER -