Distinguishing Aerosol Impacts on Climate Over the Past Century
Aerosol direct (DE), indirect (IE), and black carbon-snow albedo (BAE) effects on climate between 1890 and 1995 are compared using equilibrium aerosol-climate simulations in the Goddard Institute for Space Studies General Circulation Model coupled to a mixed layer ocean. Pairs of control(1890)-pertu...
Main Authors: | , , , , , |
---|---|
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Lawrence Berkeley National Laboratory
2008
|
Subjects: | |
Online Access: | http://digital.library.unt.edu/ark:/67531/metadc929092/ |
id |
ftunivnotexas:info:ark/67531/metadc929092 |
---|---|
record_format |
openpolar |
spelling |
ftunivnotexas:info:ark/67531/metadc929092 2023-05-15T13:11:01+02:00 Distinguishing Aerosol Impacts on Climate Over the Past Century Koch, Dorothy Menon, Surabi Del Genio, Anthony Ruedy, Reto Alienov, Igor Schmidt, Gavin A. Lawrence Berkeley National Laboratory. Environmental Energy Technologies Division. 2008-08-22 Text http://digital.library.unt.edu/ark:/67531/metadc929092/ English eng Lawrence Berkeley National Laboratory rep-no: LBNL-2176E grantno: DE-AC02-05CH11231 osti: 964407 http://digital.library.unt.edu/ark:/67531/metadc929092/ ark: ark:/67531/metadc929092 Journal Name: Journal of Climate Aerosols 54 General Circulation Models Snow Greenhouse Gases Sea Level Cloud Cover Cryosphere Climates Carbon Albedo Surface Air Article 2008 ftunivnotexas 2017-01-07T23:06:26Z Aerosol direct (DE), indirect (IE), and black carbon-snow albedo (BAE) effects on climate between 1890 and 1995 are compared using equilibrium aerosol-climate simulations in the Goddard Institute for Space Studies General Circulation Model coupled to a mixed layer ocean. Pairs of control(1890)-perturbation(1995) with successive aerosol effects allow isolation of each effect. The experiments are conducted both with and without concurrent changes in greenhouse gases (GHG's). A new scheme allowing dependence of snow albedo on black carbon snow concentration is introduced. The fixed GHG experiments global surface air temperature (SAT) changed -0.2, -1.0 and +0.2 C from the DE, IE, and BAE. Ice and snow cover increased 1.0% from the IE and decreased 0.3% from the BAE. These changes were a factor of 4 larger in the Arctic. Global cloud cover increased by 0.5% from the IE. Net aerosol cooling effects are about half as large as the GHG warming, and their combined climate effects are smaller than the sum of their individual effects. Increasing GHG's did not affect the IE impact on cloud cover, however they decreased aerosol effects on SAT by 20% and on snow/ice cover by 50%; they also obscure the BAE on snow/ice cover. Arctic snow, ice, cloud, and shortwave forcing changes occur mostly during summer-fall, but SAT, sea level pressure, and long-wave forcing changes occur during winter. An explanation is that aerosols impact the cryosphere during the warm-season but the associated SAT effect is delayed until winter. Article in Journal/Newspaper albedo Arctic black carbon University of North Texas: UNT Digital Library Arctic |
institution |
Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Aerosols 54 General Circulation Models Snow Greenhouse Gases Sea Level Cloud Cover Cryosphere Climates Carbon Albedo Surface Air |
spellingShingle |
Aerosols 54 General Circulation Models Snow Greenhouse Gases Sea Level Cloud Cover Cryosphere Climates Carbon Albedo Surface Air Koch, Dorothy Menon, Surabi Del Genio, Anthony Ruedy, Reto Alienov, Igor Schmidt, Gavin A. Distinguishing Aerosol Impacts on Climate Over the Past Century |
topic_facet |
Aerosols 54 General Circulation Models Snow Greenhouse Gases Sea Level Cloud Cover Cryosphere Climates Carbon Albedo Surface Air |
description |
Aerosol direct (DE), indirect (IE), and black carbon-snow albedo (BAE) effects on climate between 1890 and 1995 are compared using equilibrium aerosol-climate simulations in the Goddard Institute for Space Studies General Circulation Model coupled to a mixed layer ocean. Pairs of control(1890)-perturbation(1995) with successive aerosol effects allow isolation of each effect. The experiments are conducted both with and without concurrent changes in greenhouse gases (GHG's). A new scheme allowing dependence of snow albedo on black carbon snow concentration is introduced. The fixed GHG experiments global surface air temperature (SAT) changed -0.2, -1.0 and +0.2 C from the DE, IE, and BAE. Ice and snow cover increased 1.0% from the IE and decreased 0.3% from the BAE. These changes were a factor of 4 larger in the Arctic. Global cloud cover increased by 0.5% from the IE. Net aerosol cooling effects are about half as large as the GHG warming, and their combined climate effects are smaller than the sum of their individual effects. Increasing GHG's did not affect the IE impact on cloud cover, however they decreased aerosol effects on SAT by 20% and on snow/ice cover by 50%; they also obscure the BAE on snow/ice cover. Arctic snow, ice, cloud, and shortwave forcing changes occur mostly during summer-fall, but SAT, sea level pressure, and long-wave forcing changes occur during winter. An explanation is that aerosols impact the cryosphere during the warm-season but the associated SAT effect is delayed until winter. |
author2 |
Lawrence Berkeley National Laboratory. Environmental Energy Technologies Division. |
format |
Article in Journal/Newspaper |
author |
Koch, Dorothy Menon, Surabi Del Genio, Anthony Ruedy, Reto Alienov, Igor Schmidt, Gavin A. |
author_facet |
Koch, Dorothy Menon, Surabi Del Genio, Anthony Ruedy, Reto Alienov, Igor Schmidt, Gavin A. |
author_sort |
Koch, Dorothy |
title |
Distinguishing Aerosol Impacts on Climate Over the Past Century |
title_short |
Distinguishing Aerosol Impacts on Climate Over the Past Century |
title_full |
Distinguishing Aerosol Impacts on Climate Over the Past Century |
title_fullStr |
Distinguishing Aerosol Impacts on Climate Over the Past Century |
title_full_unstemmed |
Distinguishing Aerosol Impacts on Climate Over the Past Century |
title_sort |
distinguishing aerosol impacts on climate over the past century |
publisher |
Lawrence Berkeley National Laboratory |
publishDate |
2008 |
url |
http://digital.library.unt.edu/ark:/67531/metadc929092/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
albedo Arctic black carbon |
genre_facet |
albedo Arctic black carbon |
op_source |
Journal Name: Journal of Climate |
op_relation |
rep-no: LBNL-2176E grantno: DE-AC02-05CH11231 osti: 964407 http://digital.library.unt.edu/ark:/67531/metadc929092/ ark: ark:/67531/metadc929092 |
_version_ |
1766245620336558080 |