This month’s open thread. A traditional time to discuss the Arctic sea ice minimum. But NH summer heatwaves, and to be fair, snow in the southern hemisphere, are also fair game…
This month’s open thread. How about a focus on cimate science this time? Data visualizations anyone?
Guest post by Brigitte Knopf
With his encyclical “Laudato Si” the Pope has written more than a moral appeal without obligation. He has presented a pioneering political analysis with great explosive power, which will probably determine the public debate on climate change, poverty and inequality for years to come. Thus, the encyclical is also highly relevant to me as a non-Catholic and non-believer; the implications of the encyclical are very apparent through the eyes of a secular person.
The core of the encyclical makes clear that global warming is a “global problem with grave implications: environmental, social, economic, political and for the distribution of goods” (25 – where the numbers refer to the numbering in the encyclical). The reasons identified are mainly the current models of production and consumption (26). The encyclical emphasizes that the gravest effects of climate change and the increasing inequality are suffered by the poorest (48). Since we face a complex socio-ecological crisis, strategies for a solution demand an integrated approach to combating poverty (139). So far, however, governments have not found a solution for the over-exploitation of the global commons, such as atmosphere, oceans, and forests (169). Therefore, the encyclical focusses on actors, such as non-governmental organizations, cooperatives and intermediate groups (179) and calls for a dialogue between politics, science, business and religion.
The encyclical is, with 246 individual points, too extensive to be discussed in here in its entirety, but three aspects are particularly noteworthy:
- it is based unequivocally onthe scientific consensusthat global warmingis taking placeand that climate changeis man-made; itrejects thedenialof anthropogenicwarming;
- it unmasks the political and economic structures of power behind the climate change debate and stresses the importance of non-state actors in achieving change; and
- it defines the atmosphere and the environment as a common good rather than a “no man’s land”, available for anyone to pollute. This underlines that climate change is strongly related to the issues of justice and property rights.
Last week there was an international media debate on climate data which appeared to be rather surreal to me. It was claimed that the global temperature data had so far shown a “hiatus” of global warming from 1998-2012, which was now suddenly gone after a data correction. So what happened?
One of the data centers that compile the data on global surface temperatures – NOAA – reported in the journal Science on an update of their data. Some artifacts due to changed measurement methods (especially for sea surface temperatures) were corrected and additional data of previously not included weather stations were added. All data centers are continually working to improve their database and they therefore occasionally present version updates of their global series (NASA data are currently at version 3, the British Hadley Centre data at version 4). There is nothing unusual about this, and the corrections are in the range of a few hundredths of a degree – see Figure 1. This really is just about fine details. More »
In a new paper in Science Express, Karl et al. describe the impacts of two significant updates to the NOAA NCEI (née NCDC) global temperature series. The two updates are: 1) the adoption of ERSST v4 for the ocean temperatures (incorporating a number of corrections for biases for different methods), and 2) the use of the larger International Surface Temperature Initiative (ISTI) weather station database, instead of GHCN. This kind of update happens all the time as datasets expand through data-recovery efforts and increasing digitization, and as biases in the raw measurements are better understood. However, this update is going to be bigger news than normal because of the claim that the ‘hiatus’ is no more. To understand why this is perhaps less dramatic than it might seem, it’s worth stepping back to see a little context…
- T.R. Karl, A. Arguez, B. Huang, J.H. Lawrimore, J.R. McMahon, M.J. Menne, T.C. Peterson, R.S. Vose, and H. Zhang, "Possible artifacts of data biases in the recent global surface warming hiatus", Science, vol. 348, pp. 1469-1472, 2015. http://dx.doi.org/10.1126/science.aaa5632
- B. Huang, V.F. Banzon, E. Freeman, J. Lawrimore, W. Liu, T.C. Peterson, T.M. Smith, P.W. Thorne, S.D. Woodruff, and H. Zhang, "Extended Reconstructed Sea Surface Temperature Version 4 (ERSST.v4). Part I: Upgrades and Intercomparisons", Journal of Climate, vol. 28, pp. 911-930, 2015. http://dx.doi.org/10.1175/JCLI-D-14-00006.1