GISS 2006 : Australian Temperatures About The Same As The 1880s

3 Responses to GISS 2006 : Australian Temperatures About The Same As The 1880s

1. papiertigre says:

   June 12, 2012 at 6:17 am

   Is it possible that the monsoon period may change because of climate change or oceanic developments?
   Monsoon has not undergone any major change in the last 1,500 years. The climate models, which can predict the climate for a century, do not indicate any major change in the monsoon regime. So climate change is not expected to drastically alter the Indian monsoon.

   S.C. Bhan, prominent weather scientist and director, India Meteorological Department, has been associated with weather forecasting for 20 years.
   He gives P.T. Thufail a fascinating account of the monsoon phenomenon and says the rainfall this year should be normal.
   http://www.asianage.com/interview-week/climate-change-won-t-have-much-impact-monsoon-454

   No increase in temperature for Australia. No effect on the tropical monsoon. Thought I had a third one. Feel free to add your own.

   Where for art thou, climate change?

   Reply
2. papiertigre says:

   June 13, 2012 at 1:50 am

   It’s not hiding in Europe. European Alps were just as warm 900 years ago.

   Reply
3. Gail Combs says:

   August 27, 2014 at 1:33 am

   It would seem that the answer is, it depends on what location you are talking about. As some have mentioned less of a temperature differential between the equator and poles means less storminess. A shifting of the rain bands can mean drought or flooding depending on the location.

   Decreasing Asian summer monsoon intensity after 1860 AD in the global warming epoch
   (DOT)springer.com/article/10.1007%2Fs00382-012-1378-0

   The trend of the Indian summer monsoon (ISM) intensity…. In this study we reconstructed the ISM intensity during the past 270 years… A notable feature of the reconstructed ISM intensity is the gradually decreasing trend from about 1860 to the present, which is inversely related to the increasing temperature trend contemporaneously. Such “decreasing ISM intensity–increasing temperature” tendency can also be supported by ice core records and meteorological records over a wide geographic extension. The decrease in sea surface temperature gradient between tropical and north Indian Ocean, and the decrease in land-sea thermal contrast between tropical Indian Ocean and “Indian sub-continent–western Himalaya” are possibly responsible for the observed decreasing ISM trend.

   The impact of North Atlantic storminess on western European coasts: A review

   …There is evidence of periods of increased storminess during the Little Ice Age (LIA) (AD 1570–1990)…

   connection(DOT)ebscohost.com/c/articles/80000825/north-atlantic-storms-medieval-warm-period-vs-little-ice-age

   The impact of North Atlantic storminess on western European coasts: A review
   CO2Science:
   (wwwDOT)co2science.org/articles/V15/N36/C3.php

   This discussion is very much worth the read because it uses several different methods to shows storminess ” is high during the LIA with a marked transition from reduced levels during the MCA [hereafter MWP]

   New Insights into North European and North Atlantic Surface Pressure Variability, Storminess, and Related Climatic Change since 1830
   connection(DOT)ebscohost.com/c/articles/36003438/new-insights-north-european-north-atlantic-surface-pressure-variability-storminess-related-climatic-change-since-1830

   The results show periods of relatively high dp(abs)24 and enhanced storminess around 1900 and the early to mid-1990s, and a relatively quiescent period from about 1930 to the early 1960s… there is no sign of a sustained enhanced storminess signal associated with global warming…..

   Aeolian sand movement and relative sea-level rise in Ho Bugt, western Denmark, during the `Little Ice Age’
   hol(DOT)sagepub.com/content/18/6/951.abstract

   ….OSL analyses date the sand sheet to between AD 1460 ± 40 and AD 1550 ± 30 (490 ± 40 and 400 ± 30 cal. yr BP), consistent with a period of increased storminess, coastal dune building, saltmarsh formation and increased relative sea-level rise during the early part of the LIA…

   MONSOONS

   The Holocene Asian Monsoon: Links to Solar Changes and North Atlantic Climate (Links to more articles)

   A 5-year-resolution absolute-dated oxygen isotope record from Dongge Cave, southern China, provides a continuous history of the Asian monsoon over the past 9000 years. Although the record broadly follows summer insolation, it is punctuated by eight weak monsoon events lasting ?1 to 5 centuries. One correlates with the “8200-year” event, another with the collapse of the Chinese Neolithic culture, and most with North Atlantic ice-rafting events. Cross-correlation of the decadal- to centennial-scale monsoon record with the atmospheric carbon-14 record shows that some, but not all, of the monsoon variability at these frequencies results from changes in solar output.

   Paleotemperature variability in central China during the last 13 ka recorded by a novel microbial lipid proxy in the Dajiuhu peat deposit
   hol(DOT)sagepub.com/content/23/8/1123.abstract

   The Asian summer monsoon is a very important climatic component affecting the land ecosystem on the eastern Asian continent…. Fluctuations in the continuous 13 ka BNA15-derived record of relative temperature change from the Dajiuhu peat core imply that solar activity is the dominant cause for most cold events at multicentennial to submillennial timescales.

   Atlantic Forcing of Persistent Drought in West Africa
   (wwwDOT)sciencemag.org/content/324/5925/377.abstract

   ….We combined geomorphic, isotopic, and geochemical evidence from the sediments of Lake Bosumtwi, Ghana, to reconstruct natural variability in the African monsoon over the past three millennia. We find that intervals of severe drought lasting for periods ranging from decades to centuries are characteristic of the monsoon and are linked to natural variations in Atlantic temperatures…..

   Multidecadal to multicentury scale collapses of Northern Hemisphere monsoons over the past millennium
   (wwwDOT)pnas.org/content/110/24/9651.abstract

   …Late Holocene climate in western North America was punctuated by periods of extended aridity called megadroughts. These droughts have been linked to cool eastern tropical Pacific sea surface temperatures (SSTs)…Several megadroughts are evident, including a multicentury one, AD 1350–1650, herein referred to as Super Drought, which corresponds to the coldest period of the Little Ice Age. Synchronicity between southwestern North American, Chinese, and West African monsoon precipitation suggests the megadroughts were hemispheric in scale. Northern Hemisphere monsoon strength over the last millennium is positively correlated with Northern Hemisphere temperature and North Atlantic SST. The megadroughts are associated with cooler than average SST and Northern Hemisphere temperatures. Furthermore, the megadroughts, including the Super Drought, coincide with solar insolation minima, suggesting that solar forcing of sea surface and atmospheric temperatures may generate variations in the strength of Northern Hemisphere monsoons. Our findings seem to suggest stronger (wetter) Northern Hemisphere monsoons with increased warming.

   A 2,300-year-long annually resolved record of the South American summer monsoon from the Peruvian Andes
   (wwwDOT)pnas.org/content/108/21/8583.abstract

   Decadal and centennial mean state changes in South American summer monsoon (SASM) precipitation during the last 2,300 years are detailed using an annually resolved authigenic calcite record of precipitation ?18O from a varved lake in the Central Peruvian Andes. ….shows that ?18O peaked during the Medieval Climate Anomaly (MCA) from A.D. 900 to 1100, providing evidence that the SASM weakened considerably during this period. Minimum ?18O values occurred during the Little Ice Age (LIA) between A.D. 1400 and 1820, reflecting a prolonged intensification of the SASM that was regionally synchronous. After the LIA, ?18O increased rapidly, particularly during the current warm period (CWP; A.D. 1900 to present), indicating a return to reduced SASM precipitation that was more abrupt and sustained than the onset of the MCA. Diminished SASM precipitation during the MCA and CWP tracks reconstructed Northern Hemisphere and North Atlantic warming and a northward displacement of the Intertropical Convergence Zone (ITCZ) over the Atlantic, and likely the Pacific. Intensified SASM precipitation during the LIA follows reconstructed Northern Hemisphere and North Atlantic cooling, El Niño-like warming in the Pacific, and a southward displacement of the ITCZ over both oceans. These results suggest that SASM mean state changes are sensitive to ITCZ variability as mediated by Western Hemisphere tropical sea surface temperatures, particularly in the Atlantic.

   A 1,200-year perspective of 21st century drought in southwestern North America
   http://www.pnas.org/content/107/50/21283.full

   Several notable droughts extended across much of western North America, including severe and sustained droughts in the late 16th century and the medieval period, between 900–1300 AD (23–25). In this period, episodes of extensive severe drought are documented by a variety of proxy data, but most dramatically by evidence of trees rooted in lakes and river courses in the Sierra Nevada and northwestern Great Basin (26, 27). These droughts appear to have exceeded the duration and magnitude of any subsequent droughts in western North America (5, 25).
   …
   The medieval period was characterized by widespread and regionally severe, sustained drought in western North America. Proxy data documenting drought indicate centuries-long periods of increased aridity across the central and western U.S. (Fig 2F) (25, 22 ). In the Colorado and Sacramento River basins, reconstructions show decadal periods of persistently below average flows during several intervals including much of the 9th, 12th, and 13th centuries (40–42) (Fig 2E). The 12th century episode, also reflected in precipitation and drought extent (13, 25, 43, 44), was particularly severe and persistent and was associated with a peak in solar irradiance and nadir in volcanic activity (4) (Fig. 2A).
   …
   The warmest, driest, most widespread interval of drought documented in the streamflow, DAI and temperature records occurred in the mid-12th century (Fig. 2 and Fig. S2). The driest 10-year period in the Colorado River reconstruction and the 6th most extensive drought-area in the Southwest was 1146 to 1155. Decades ending in 1153, 1154, 1156, 1157, and 1158 were similarly dry and warm. The decade 1146–1155 ranked in the 80th percentile of southern Colorado Plateau temperatures. Several decades in the late 9th and 13th centuries were nearly as warm and dry.

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