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Great atmosphere at the equator

When editing my last posting I'm 6 (see below) met and have decided to me to see this is mentioned, relevant "Equatorial Studies * closer.

Map of mean annual global precipitation (cm / month) with locations of proxy records discussed in this paper. 1, Dandak Cave ( Sinha et al, 2007 ;. This study), 2, Wanxiang Cave ( Zhang et al, 2008 .), 3, Vietnam (Buckley et al ., 2010 ), 4, Makassar Strait ( [Oppo et al., 2009] and [Tierney et al., 2009] ); 5 and; 6 Palao and Washington Islands ( Sachs et al., 2009 ); 7, El Junco Crater Lake on Galapagos Island ( [Conroy et al., 2008] and [Conroy et al., 2009] ); 8, Ecuador ( Moy et al., 2002 ); 9 Northeast Peru ( Reuter et al., 2009 ); 10, Peruvian shelf ( Rein et al., 2004 ); 11, Lake Naivasha ( Verschuren et al., 2000 ); 12, Gulf of Mexico ( Richey et al., 2007 ); 13, Cariaco Basin ( [Haug et al., 2001] and [Black et al., 2007] ); 14, Icelandic Shelf ( Massé et al., 2008 G. Massé, S.J. Rowland, M.-A. Sicre, J. Jacob, E. Jansen and S.T. Belt, Abrupt climate changes for Iceland during the last millennium: evidence from high resolution sea ice reconstructions, Earth Planet. Sci. Lett. 269 (2008), pp. 564–568. View Record in Scopus the authors that a smaller Monsoonaktivität can be associated with cooler during the Little Ice Age, Northern Hemisphere temperatures. The reference to Sinha et al., 2007 (PDF format, 220 KB) is appropriate. From Fig 3 we can pick out that 900-1250 AD are only 4 stages of "weaker monsoon, compared to 12 stages of" stronger monsoon "excellent - not to forget that these are multiple, multi annuale phases. In contrast, within the period 1250 to - in the transition from LIA in MWP - 1500 AD 5 periods of "weak monsoon ', the third phase of about 1330-1420 AD lasted. "Stronger monsoon 'phase can be counted about 5, where the strength is not comparable to the phases in the MWP is. find In the third study Buckley et al., 2010 (PDF format, 640 KB) Evidence for persistent drought in the Southeast Asian region during the late MWP and the early Little Ice Age (Fig. 2, Fig 3). Your study area is Angkor in Cambodia. You write under "Discussion": Prolonged drought over mainland Southeast Asia, Which corresponded to the time of the transition from the Medieval Climate Anomaly (MCA) into the Little Ice Age (LIA), appears to have coincided with numerous societal vulnerabilities and operational constraints to create a situation that led to the failure of Angkor as a viable city.

In the fourth study, the reference to the posting ranges from 5 January . Although I would like to briefly

Tierney et al.

received in 2009. You write in the abstract:

Furthermore, the centennial-scale oscillations in our data follow known changes in Northern Hemisphere climate (eg, the Little Ice Age and Medieval Warm Period), implying a dynamic link between Northern Hemisphere temperatures and IPWP [ Indo-Pacific Warm Pool, WVB] hydrology. is

In fifth and sixth, the Study by Sachs et al

., 2009

(Pdf file, 1 MB) mentioned. From the abstract we learn:

Here we report microbiological, molecular and hydrogen isotopic evidence from lake sediments in the Northern Line Islands, Galapagos Islands and Palau indicating that the Pacific intertropical convergence zone was south of its modern position for most of the past millennium , by as much as 500 km during the Little Ice Age. A colder Northern Hemisphere at that time, possibly Resulting from lower solar irradiance, may have driven the intertropical convergence zone south.

If a colder northern hemisphere during the Little Ice Age may be held responsible if the "inter-tropical convergence zone" is moved to the south is, could be a warmer northern hemisphere during the MWP be possibly responsible for the "inter-tropical convergence zone" at this time further north was the reason?

Two studies by Conroy et al.

2008 (PDF format, 1.5 MB) and 2009 be subsumed under seventh. I wish to highlight here, 8 and 9 from the "Gallapagosstudie" from 2008.

Reuter et al., 2009, we find listed ninth. In their study:

A new perspecitve on the hydro-climate variability in northern South America during the Little Ice Age
(PDF format, 250 KB) Supply evidence from their proxy data from "Cascayunga cave in Northeast Peru" for an increase in rainfall during the Little Ice Age compared to the 20th century by up to 20% (Fig. 2, also 4: Results and Discussion).

devoted to the "Peruvian Shelf" is headed in section 10,

Rein et al., 2004

(PDF format, 520 KB). They write:

Here, we present a high resolution marine record from El Nino flood Peru. A period of extreme drought without strong flooding occurred from AD 800-1250.

revealing this, FIG second Eleventh, we change with the continent and come to the aforementioned study,

Rainfall and drought in equatorial east Africa during the past 1.100 years from Verschuren et al., 2000. I quote again from the Abstract:

Our data Indicate that, over the past millennium, equatorial east Africa has alternated between constrasting climate conditions, with Significantly drier climate than today during the 'Medieval Warm Period' (~ 1000-1270 ad) A relatively wet climate and during the 'Little Ice Age' (~ 1270-1850 ad) Which was interrupted by three prolonged dry episodes.

12th leads us to the "Gulf of Mexico and on the study:

A 1400-year multi-proxy record of climate variability from the Northern Gulf of Mexico

(PDF format, 200 KB) by Richey et al, 2007.. ;

to summarize:

Two multidecadal intervals of sustained high Mg / Ca Indicate that Gulf of Mexico sea surface temperatures (SSTs) were as warm or warmer than near modern conditions between 1000 and 1400 yr BP foraminiferal Mg / Ca during the coolest interval of the Little Ice Age (ca. 250 yr BP) Indicate that SST was 2-2.5 ° C below modern SST.

with 13, leads us to the "Ciriaco Basin and the Work of

Haug et al., 2001

(pdf format, 6.15 MB) and

Black et al., 2007

(pdf format, 620 KB).

In Haug et al. is from 3 a MWP editorial. You can also write to 1306: Higher but variable precipitation

is therefore indicated from 1.05 to 0.7 ka, the interval of time sometimes referred to as the "Medieval Warm Period." Black et al. state in the "Conclusions" include:

The full 8-century record reveals that tropical SSTs during the Last Millennia are more variable than previously thought, with some warmth MWP, LIA significant cooling, and abruptly twentieth-century warming.

It is very informative and interesting to note how much research has been in the "equatorial zones of the earth yet done so. to say that even here at all was no evidence for a warmer climate during the MWP, seems to be missed.

__________

* Let's be generous and go to the 30th degree of latitude north. Study "2" and study "14" thus excrete. Study "12" was taken from me. Study "8" -. Moy et al, 2002 (PDF format, 184 KB) - In my opinion low yields and was therefore not treated.