Why does land warm up faster than the oceans? This is because of the strong increase in temperature anomaly trends as we approach the poles, particularly at high Northern latitudes. Ok, well i am making a general comment about the issue of document shock. The comprehensive surface station data based on Bakyraev 2010 gives 0.639 degrees C/decade for 60-90N between 1979 and 2009. The SST data where available is used up to 100km from any coast, but data from any source is extended to a maximum radius of 1200km if no other measured data points are present within this range. Data above this latitude is considered unreliable, and is not available. In such a case (warm water + ice), the water will cool to zero in proportion to the amount of ice that melts (energy equivalence), and then the ice/water mix will remain at 0C. Comparing the results with GISS over the same grid area over dates where the recent ice station and buoy data is used, the correlation is just as high. Skeptical Science New Research for Week #38, 2020. Figure 4: DMI summer melt season temperatures and annual DMI temperature anomaly as well as five year running averages. This was the case last year too, while earlier years in the DMI analysis period (1958-2010) hardly ever shows Arctic melt season temperatures this cold (Frank Lansner). How are these temperature records reconciled with the DMI summer data? Offline PDF Version  |  The resolution of these operational models has continually increased to take advantage of increased computing power and higher spatial resolution satellite data. Is the GISS Arctic data consistent with other studies of Arctic temperature trends and other data sources? To claim that the Arctic is cooling based on Summer surface temperature values over sea ice is to misunderstand the data. See current data from the National Snow and Ice Data Centre (NSIDC). Frank Lansnser goes on to show data from GISS July polar views (where individual grid cells show large variability) and compares this with graphics of DMI data for July 2010 to cast doubt on the validity of the GISS gridded values in the polar regions. Please, stop measuring temperatures during the melt season! A study using data from stations and Polar drifting ice buoys showed that near surface air temperatures over the pack ice are relatively homogenous, with a CLS (correlation length scale) of 900-1000 km (Rigor 2000). If we plot this average positive trend and five year running averages on the same vertical scale below (red) it gives clearer context to the Lansner chart of Summer melt average temperatures (green). bozzza, a little more argument would be helpful. However, the data is treated consistently over the longer term, which is very important for trend analysis. It is therefore not surprising that this limiting effect is also apparent on the gridded DMI data, here monthly (30 day) rolling averages, averaged decadally for clarity (the zero limit is less “flat-topped” in this case partly due to the averaging of data over 10 degrees of latitude). While summer maximums have showed little trend, the annual average Arctic temperature has risen sharply in recent decades. Comments Policy... You need to be logged in to post a comment. Peter Berenyi also posted a similar chart here on Skeptical Science. Some might show more but the point I am making is about getting to the guts of it otherwise the groupthink of democracy will never be convinced enough to vote for action. The former USSR polar ice station programme and IABP programme give 2m air temperature data from the high Arctic. Whilst some caution is advised by GISS in using the interpolated data in the Arctic region, it appears that GISS trends in the Arctic region as a whole are consistent with other high latitude data sets, and show similar trends (in terms of annual averaged values) with other data sets which cover the region above 80N. Link to this page. Animation. Use the controls in the far right panel to increase or decrease the number of terms automatically displayed (or to completely turn that feature off). It's hidden, because it's latent heat . Figure 8: MSU Lower Troposphere, and GISS and ERA-Interim surface temperature trend variation with latitude for most recent 30 and 20 year periods. It would be intuitive that these seasonal warming patterns would affect the overall DMI temperature anomaly trend, and this is the case. These trend figures are also consistent with those from a recent comprehensive surface data based study of the Arctic (Bekryaev 2010) which gives 0.364 degrees C/decade from 60-90N over this same period. Ocean and Ice - Danish Meteorological Institute - Lyngbyvej 100 - 2100 Copenhagen Ø - … Monthly averaged global data sets often cited and discussed are (HadCRUT3 from the UK Met Office Hadley Centre in conjunction with the Climate Research Unit (CRU) and the Lower Troposphere weighted values from combined satellite Microwave Sounder Unit (MSU) and Advanced MSU (AMSU) time series from the teams at Remote Sensing Systems (RSS) and University of Alabama in Huntsville (UAH). These changes could be linked to minor differences in the apparent Summer melt temperature, (there are small differences between the ERA-40 and the T511 outputs in the overlap period in 2002). 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