Ovulation Scope And Detecting Pregnancy

New evidence for the occurrence of northern hemispheric climate change information portal MWP

5th August this year - people in conversation: part III - pointed Frederic Carpentier Ljungqvist, my then interviewed, indicated that he would publish a new work in the fall

He wrote that

This autumn I will come. out with a new paper, with improved quantitative multi-proxy temperature reconstruction for the extra-tropical Northern Hemisphere covering the last 2,000 Years.

late but I'm worth reading by a posting on this blog:

klimablog.de

been reminded that I actually wanted to watch this work more accurately.

September 2010, however, such work "A NEW RECONSTRUCTION OF TEMPERATURE IN THE EXTRA-TROPICAL Variability NORTHERN HEMISPHERE DURING THE LAST TWO MILLENNIA" in Geografiska Annaler (See here:

http://onlinelibrary.wiley.com

) appeared.

Ljungqvist in this study offers a new

temperature reconstruction for the extra-tropical Northern Hemisphere (90-30 ° N) with decadal resolution for the last two Millennia.

Ljungqvist: A new reconstruction ..., 340

to use that gets 30 "temperature-sensitive proxy records", all of which to AD 1000, AD 16 to 1 back - as mentioned Ljungqvist besides the difference to previous studies that (Jones et al, 1998;. et al, 1999;. Crowley and Lowery 2000) [1] in his eyes "set very limited and unevenly distributed of proxy data" are all just a ( 344 possessed).

His proxy records, in contrast, mixed well composed

two historical documentary records, 3 marine sediment records, 5 lake sediment records, 3 speleothem delta 18O records, two ice-core delta 18O records, 4 varved thickness sediment records , 5 tree-ring width records, 5 tree-ring maximum late wood density records, and a delta 13 C tree-ring record.

Ljungqvist: A new reconstruction ..., 340

Nun zu den Resultaten. Für mich nicht überraschend zeigen die Datensätze klar und deutlich eine "distinct Medieval Warm Period" (347) an. In Ljungqvists Résumé klingt das so:


It is a rather conventional temperature history of the last two millennia, similar to that already outlined in Lamb (1977)[2], that appears in our reconstruction, with a Roman Warm Period c. AD 1-300, a Dark Age Cold Period c. AD 300-800, a Medieval Warm Period c. AD 800-1300 and a Little Ice Age c. AD 1300-1900, followed by the twentieth-century warming.

Ljungqvist: A new reconstruction ..., 343.

Our new two-millennia long extra-tropical Northern Hemisphere (90-30 ° N) temperature reconstruction supports a distinct Medieval Warm Period and to evan more distinct Little Ice Age, followwed by a rapid twentieth-century warming.


Ljungqvist: A new reconstruction ..., 347

to be a bit ironic, it seems that after all the ups and downs of recent years, Dr. Lamb and his statements probably end not located so completely wrong.

I was indulged in at the end of a short side-swipe, not directly on the MWP to hand out. Ljungqvist, probably as one of the few who points out that the proxy reconstruction only in conjunction with the instrumentally obtained CRUTEM3 + HadSST2 90-30 ° N temperature data (Brohan et al 2006;.. Rayner et al, 2006) [3] the image of the "current" warming (1990 +) features, which we know all too well. "The proxy reconstruction itself," he writes,

does not show seeking to unprecendented warming but we must consider that only a few records used in the reconstruction [na after all, 11-1999, WVB] extend into the 1990s.

Ljungqvist: A new reconstruction ..., 343

__________

[1] Jones, PD, Briffa, KR, Barnett, TP and Tett, SFB, 1998: High-resolution palaeoclimatic records for the last millennium: interpretation, integration and comparison with General Circulation Model control-run temperatures. The Holocene, 8: 455-471.

Mann, M.E., Bradley, R.S. and Hughes, M.K., 1999: Northern hemisphere temperatures during the past millennium: inferences, uncertainties, and limitations. Geophysical Research Letters, 26: 759-762.

Crowley, T.J. and Lowery, T., 2000: How warm was the Medieval Warm Period? A comment on 'man-made versus natural climate change'. Ambio, 29: 51-54.

[2] Lamb, H.H., 1977: Climate: present, past and future 2. Climatic history and the future. London, Methuen: 835 p.

[3] Brohan, P., Kennedy, J., Haris, I., Tett, S.F.B. and Jones, PD, 2006: Uncertainty estimates in regional and global observed temperature changes: a new dataset from 1850th Journal of Geophysical Research, 111: D12106.

Rayner, NA, Brohan, P., Parker, DE, Folland, CK, Kennedy JJ, Vanicek M, Ansell, T. and Tett, SFB, 2006: Improved Analyses of changes and uncertainties in marine temperature measured in situ since the mid-nineteenth century: the HadSSt2 dataset. Journal of Climate, 19: 446-469.