The East Asian Summer Monsoon : A comparison of present, Holocene and Eemian climate

The East Asian Summer Monsoon (EASM) is a major component in Asian climate. It is largely driven by climatic factors such as humidity, solar insolation and temperature. For at least 50 years the EASM has been studied extensively by scientists regarding its current strength. Models have been recreati...

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Main Author: Jacobson, Holger
Format: Bachelor Thesis
Language:English
Published: Institutionen för ekologi, miljö och geovetenskap 2014
Subjects:
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-88062
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spelling ftumeauniv:oai:DiVA.org:umu-88062 2023-10-09T21:52:04+02:00 The East Asian Summer Monsoon : A comparison of present, Holocene and Eemian climate Jacobson, Holger 2014 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-88062 eng eng Institutionen för ekologi, miljö och geovetenskap http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-88062 info:eu-repo/semantics/openAccess East Asian Summer Monsoon Eemian Holocene Climate Climate Research Klimatforskning Student thesis info:eu-repo/semantics/bachelorThesis text 2014 ftumeauniv 2023-09-22T13:45:52Z The East Asian Summer Monsoon (EASM) is a major component in Asian climate. It is largely driven by climatic factors such as humidity, solar insolation and temperature. For at least 50 years the EASM has been studied extensively by scientists regarding its current strength. Models have been recreating past monsoon intensity as well as attempted to predict future intensity. As the monsoon undergoes changes, the climatic shifts responsible for them leave various traces behind; geochemical as well as biological, and these have been preserved and recorded in various locales on the planet. The most significant climatic change is the variation between glacial and interglacial periods which have been alternating for the last 2.6 million years and the EASM has changed in tune with the climate during this time. The EASM follows the δ18O-record in speleothems found in Eastern Asia as well as in ice cores from Greenland. Various geochemical and biological tracers seem to reflect these fluctuations in climate locally as well as globally over a 200 kyr period. The current intensity of the EASM seems to be one of decreasing strength, a phase that has persisted since the Holocene climatic optimum 8.5 kyr ago. Recently however a decrease in the East Asian Winter Monsoon has been confirmed, indicating an increase in EASM intensity. During the Holocene the EASM reached peak intensity during the Holocene climatic optimum but has fluctuated largely in tune with solar insolation. This is also true for the Eemian period although some events such as the mid-Eemian cooling show that factors other than solar insolation regulate monsoon intensity over large time periods. The future of the EASM seems to be one of increased strength due to climate change and models predict both increased wind speeds and an increasing occurrence of extreme precipitation despite decreasing solar insolation. Bachelor Thesis Greenland Umeå University: Publications (DiVA) Greenland
institution Open Polar
collection Umeå University: Publications (DiVA)
op_collection_id ftumeauniv
language English
topic East Asian Summer Monsoon
Eemian
Holocene
Climate
Climate Research
Klimatforskning
spellingShingle East Asian Summer Monsoon
Eemian
Holocene
Climate
Climate Research
Klimatforskning
Jacobson, Holger
The East Asian Summer Monsoon : A comparison of present, Holocene and Eemian climate
topic_facet East Asian Summer Monsoon
Eemian
Holocene
Climate
Climate Research
Klimatforskning
description The East Asian Summer Monsoon (EASM) is a major component in Asian climate. It is largely driven by climatic factors such as humidity, solar insolation and temperature. For at least 50 years the EASM has been studied extensively by scientists regarding its current strength. Models have been recreating past monsoon intensity as well as attempted to predict future intensity. As the monsoon undergoes changes, the climatic shifts responsible for them leave various traces behind; geochemical as well as biological, and these have been preserved and recorded in various locales on the planet. The most significant climatic change is the variation between glacial and interglacial periods which have been alternating for the last 2.6 million years and the EASM has changed in tune with the climate during this time. The EASM follows the δ18O-record in speleothems found in Eastern Asia as well as in ice cores from Greenland. Various geochemical and biological tracers seem to reflect these fluctuations in climate locally as well as globally over a 200 kyr period. The current intensity of the EASM seems to be one of decreasing strength, a phase that has persisted since the Holocene climatic optimum 8.5 kyr ago. Recently however a decrease in the East Asian Winter Monsoon has been confirmed, indicating an increase in EASM intensity. During the Holocene the EASM reached peak intensity during the Holocene climatic optimum but has fluctuated largely in tune with solar insolation. This is also true for the Eemian period although some events such as the mid-Eemian cooling show that factors other than solar insolation regulate monsoon intensity over large time periods. The future of the EASM seems to be one of increased strength due to climate change and models predict both increased wind speeds and an increasing occurrence of extreme precipitation despite decreasing solar insolation.
format Bachelor Thesis
author Jacobson, Holger
author_facet Jacobson, Holger
author_sort Jacobson, Holger
title The East Asian Summer Monsoon : A comparison of present, Holocene and Eemian climate
title_short The East Asian Summer Monsoon : A comparison of present, Holocene and Eemian climate
title_full The East Asian Summer Monsoon : A comparison of present, Holocene and Eemian climate
title_fullStr The East Asian Summer Monsoon : A comparison of present, Holocene and Eemian climate
title_full_unstemmed The East Asian Summer Monsoon : A comparison of present, Holocene and Eemian climate
title_sort east asian summer monsoon : a comparison of present, holocene and eemian climate
publisher Institutionen för ekologi, miljö och geovetenskap
publishDate 2014
url http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-88062
geographic Greenland
geographic_facet Greenland
genre Greenland
genre_facet Greenland
op_relation http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-88062
op_rights info:eu-repo/semantics/openAccess
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