Driftinformation
Ett driftavbrott i samband med versionsuppdatering är planerat till 10/12-2024, kl 12.00-13.00. Under den tidsperioden kommer DiVA inte att vara tillgängligt
Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
An updated global atmospheric paleo-reanalysis covering the last 400 years
Ansvarig organisation
2022 (Engelska)Ingår i: Geoscience Data Journal, E-ISSN 2049-6060, Vol. 9, nr 1, s. 89-107Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Data assimilation techniques are becoming increasingly popular for climate reconstruction. They benefit from estimating past climate states from both observation information and from model simulations. The first monthly global paleo-reanalysis (EKF400) was generated over the 1600 and 2005 time period, and it provides estimates of several atmospheric fields. Here we present a new, considerably improved version of EKF400 (EKF400v2). EKF400v2 uses atmospheric-only general circulation model simulations with a greatly extended observational network of early instrumental temperature and pressure data, documentary evidences and tree-ring width and density proxy records. Furthermore, new observation types such as monthly precipitation amounts, number of wet days and coral proxy records were also included in the assimilation. In the version 2 system, the assimilation process has undergone methodological improvements such as the background-error covariance matrix is estimated with a blending technique of a time-dependent and a climatological covariance matrices. In general, the applied modifications resulted in enhanced reconstruction skill compared to version 1, especially in precipitation, sea-level pressure and other variables beside the mostly assimilated temperature data, which already had high quality in the previous version. Additionally, two case studies are presented to demonstrate the applicability of EKF400v2 to analyse past climate variations and extreme events, as well as to investigate large-scale climate dynamics.

Ort, förlag, år, upplaga, sidor
John Wiley & Sons, Ltd , 2022. Vol. 9, nr 1, s. 89-107
Nyckelord [en]
climate reconstruction, ensemble Kalman fitting, paleoclimate data assimilation
Nationell ämneskategori
Klimatforskning
Identifikatorer
URN: urn:nbn:se:polar:diva-8990DOI: 10.1002/gdj3.121OAI: oai:DiVA.org:polar-8990DiVA, id: diva2:1727050
Konferens
2023/01/14
Tillgänglig från: 2023-01-14 Skapad: 2023-01-14 Senast uppdaterad: 2023-03-14Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltexthttps://doi.org/10.1002/gdj3.121
I samma tidskrift
Geoscience Data Journal
Klimatforskning

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 44 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf