Chironomid-based reconstructions of summer air temperature from lake deposits in Lyndon Stream, New Zealand spanning the MIS 3/2 transition


Autoria(s): Woodward, Craig
Data(s)

01/01/2007

Resumo

We present chironomid-based temperature reconstructions from lake sediments deposited between ca 26,600 cal yr BP and 24,500 cal yr BP from Lyndon Stream, South Island, New Zealand. Summer (February mean) temperatures averaged 1 1C cooler, with a maximum inferred cooling of 3.7 1C. These estimates corroborate macrofossil and beetle-based temperature inferences from the same site and suggest climate amelioration (an interstadial) at this time. Other records from the New Zealand region also show a large degree of variability during the late Otiran glacial sequence (34,000–18,000 cal yr BP) including a phase of warming at the MIS 2/3 transition and a maximum cooling that did not occur until the global LGM (ca 20,000 cal yr BP). The very moderate cooling identified here at the MIS 2/3 transition confirms and enhances the long-standing discrepancy in New Zealand records between pollen and other proxies. Low abundances (o20%) of canopy tree pollen in records from late MIS 3 to the end of MIS 2 cannot be explained by the minor (o5 1C) cooling inferred from this and other studies unless other environmental parameters are considered. Further work is required to address this critical issue.

Identificador

http://pure.qub.ac.uk/portal/en/publications/chironomidbased-reconstructions-of-summer-air-temperature-from-lake-deposits-in-lyndon-stream-new-zealand-spanning-the-mis-32-transition(3cd540af-5dec-49bc-ab79-7a6cb29bfe33).html

http://dx.doi.org/10.1016/j.quascirev.2006.06.004

http://www.scopus.com/inward/record.url?scp=33845956357&partnerID=8YFLogxK

Idioma(s)

eng

Direitos

info:eu-repo/semantics/restrictedAccess

Fonte

Woodward , C 2007 , ' Chironomid-based reconstructions of summer air temperature from lake deposits in Lyndon Stream, New Zealand spanning the MIS 3/2 transition ' Quaternary Science Reviews , vol 26(1-2) , no. 1-2 , pp. 142-154 . DOI: 10.1016/j.quascirev.2006.06.004

Palavras-Chave #/dk/atira/pure/subjectarea/asjc/1900/1904 #Earth-Surface Processes
Tipo

article