Sentences with phrase «hemisphere temperature analyses»

As the southern hemisphere is largely ocean, southern hemisphere temperature analyses are largely drawn from sea surface temperatures measured from ships.

Not exact matches

In his Figure 5 under a section entitled «A New Northern Hemisphere Summer Temperature Record» he shows that the mid to late 20th century temperature as determined from tree ring analysis is far warmer than any period in the past that his analysis includes (this only goes back tTemperature Record» he shows that the mid to late 20th century temperature as determined from tree ring analysis is far warmer than any period in the past that his analysis includes (this only goes back ttemperature as determined from tree ring analysis is far warmer than any period in the past that his analysis includes (this only goes back to 1400 AD).

The analysis focuses on a period beginning after World War 2 when a decades - long climb in global temperatures stopped, with the northern hemisphere, particularly, cooling somewhat.

The original hockey - stick analysis plotted reconstructed Northern Hemisphere mean temperature variations since 1400 and found that since 1900, temperatures have increased to give the graph its distinctive shape (Nature 1998, 392, 779 - 787).

Cross correlation with SST in the northern hemisphere reveals a lag of about 5 years after temperature, spectrum analysis shows an oscillation of about 65 years as SST in the polar ocean and the geomagnetic index.

This finding, though based on uncertain reconstructions of past ENSO behaviour, is entirely independent of previous analyses confined to the restricted instrumental climate record...... such a trend would seem consistent with the response to the general increase in explosive volcanism during the fifteenth — nineteenth centuries in conjunction with reduced solar irradiance that is responsible for the millennial cooling trend of Northern Hemisphere mean temperature before modern anthropogenic warming.

It concluded that late 20th century Northern Hemisphere temperatures were not unprecedented, contradicting the majority of the other analyses which came before and after it.

GISS Surface Temperature Analysis 1979 - 2005 -LRB--0.8 °C to +0.8 °C), showing asymmetrical distribution of warming and cooling between hemispheres.

A recent analysis of a number of different proxy temperature records suggests that Northern Hemisphere decadal - scale averages over land may have been as much as approximately 0.2 — 0.4 °C above the 1850 — 2006 mean from roughly 950 — 1150 AD (32).

The original hockey - stick analysis was published in the leading science journal Nature (1998, 392, pp. 779 - 787) and plotted reconstructed mean temperature variations in the Northern Hemisphere since 1400.

Both analyses yield a reconstructed Northern Hemisphere mean temperature history quite similar to that of MBH98, and demonstrate skill against independent 19th century instrumental (2) data (RE = 0.39, 0.33, respectively — only moderately lower than the MBH98 result RE = 0.51).

Indeed, when we used the corrected version of the western U.S. tree ring data in our analysis, our validation tests gave us the green light; we could indeed now meaningfully reconstruct Northern Hemisphere average temperatures over the entire past millennium.