What Is A Positive Correlation Between GISS Temperature Data?

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Figure 16. Negative correlation between GISS temperature data and the standardized Tlingit Point composite ring width with year on year differences from 1881-1950 for the month of April. Figure 17. Negative correlation between GISS temperature data and the Tlingit Point composite ring width with year on year differences from 1881-1950 for September-November. Figure 18. Strong positive correlation between GISS temperature data and the Tlingit Point composite ring width with year on year differences from 1881-1950 for the summer months of May-August. Figure 19. Even stronger positive correlation between GISS temperature data and the Tlingit Point composite ring width with year on year differences from 1951-2015 for the summer months of…show more content…
The National Parks Service glacial retreat map shows that the glaciers which covered the area around Tlingit Point retreated between 1860 and 1892. During this time the annual ring width almost doubled, and then continued to stay at this wider ring width as time went on (Figure 3; Figure 26).
Interestingly, from 1833-1876 the tree rings at Tlingit Point are strongly correlated with previous October and November temperatures, especially during the early part of this period when there were only a few trees, though this could also be due to a colder climate during the end of the Little Ice Age (Figure 4; Figure 7; Figure 8). Though, starting about 1860, the trees here began to have a very strong correlation with late spring and then summer temperatures, which has only gotten stronger over time (Figure 9; Figure 10; Figure 11; Figure 12; Figure 18; Figure 19). Previous studies of sites in the Glacier Bay area have found that trees located at higher elevations are becoming more positively correlated with summer temperature over time, which is true for this site as well (Jarvis et al., 2013). This means that the trees are growing larger rings as summer temperatures rise, likely because these warmer temperatures mean more valuable growing days. Not surprisingly, summer sea surface temperatures (SSTs) are also positively correlated with ring width, because these temperatures are similar to land temperatures

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