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Global Warming and Climate Change skepticism examined Sea Grant > Home Data.GISS: GISS Surface Temperature Analysis: 2011 Annual Analysis Global Temperature in 2011, Trends, and Prospects By James Hansen, Reto Ruedy, Makiko Sato and Ken Lo — 18 January 2012 The annual 2011 surface air temperature anomaly relative to base period 1951-1980 is shown in Fig. 1 at both the 1200 km and 250 km resolutions of the GISS analysis (Hansen et al., 2010). The global mean anomaly, averaged over the area with a defined anomaly is 0.51°C for 1200 km resolution and 0.44°C for 250 km resolution. The 1200 km resolution analysis, because it fills in estimated anomalies in Africa, Canada, Siberia, and especially in the Arctic, is believed to provide the better estimate for the full global anomaly, as discussed by Hansen et al. (2010) (note 1). Figure 1. The global temperature anomaly from 1880 through 2011 is shown in Fig. 2 for the standard (1200 km resolution data) GISS analysis (note 2). Figure 2. Figure 3. Seasonal-Mean Temperature Anomalies Figure 4. Figure 5. Does the data support skepticism? Figure 6. Figure 7. El Niño Cycle Figure 8.

Educational Partnership Program Disputing the ‘consensus’ on global warming « Climate Progress By Joe Romm on June 16, 2010 at 3:49 pm "Disputing the ‘consensus’ on global warming" Science is in many ways the opposite of decision by consensus. I have never liked the use of the word “consensus” as it is typically applied in the climate arena. I wrote an article on this subject in 2008, “The cold truth about climate change: [Disinformers] continue to insist there’s no consensus on global warming. When James Hansen read the first draft of the piece, he wrote me back, “Very important for the public to understand this “” why has nobody articulated this already?” The subject arises again because of some ill-chosen words by climatologist Mike Hulme in an article, “Climate Change: what do we know about the IPCC? Hulme has now issued two clarifications on his website. Even Hulme’s original paper made clear that many IPCC scientists thought the IPCC lowballed likely sea level rise this century. Then Lacis explained exactly what he meant on DotEarth: and Doh! Related Posts:

NOAA's Satellite and Information Service (NESDIS) NOAA: Warmest May, spring, and Jan-May on record « Climate Progr By Joe Romm on June 15, 2010 at 5:03 pm "NOAA: Warmest May, spring, and Jan-May on record" NOAA’s National Climatic Data Center has published its monthly “State of the Climate Report.” The combined global land and ocean surface temperature was the warmest on record for May, March-May (Northern Hemisphere spring-Southern Hemisphere autumn), and the period January-May. The warming in May is greatest precisely where climate science suggested it would be — the high northern latitudes (see “What exactly is polar amplification and why does it matter?” And it bears repeating, the record temperatures we’re seeing now are especially impressive because we’ve been in “the deepest solar minimum in nearly a century.” Finally, the Arctic sea ice extent continues to break records itself, as data from both the Japan Aerospace Exploration Agency (JAXA) and National Snow and Ice Data Center (NSIDC) make clear: Will we break records for the whole year?

GISS: Science Briefs: Whither U.S. Climate? Whither U.S. Climate? By James Hansen, Reto Ruedy, Jay Glascoe and Makiko Sato — August 1999 What's happening to our climate? Empirical evidence does not lend much support to the notion that climate is headed precipitately toward more extreme heat and drought. How can the absence of clear climate change in the United States be reconciled with continued reports of record global temperature? A picture of how U.S. climate change during the past half century compared with the rest of the world is shown in Figure 2. Yet in the U.S. there has been little temperature change in the past 50 years, the time of rapidly increasing greenhouse gases — in fact, there was a slight cooling throughout much of the country (Figure 2). Is this a temporary fluke, a chaotic regional climate fluctuation? In order to answer such questions and predict future climate change reliably, a prerequisite is an understanding of the cooling of the past half-century in the U.S. Reference Hansen, J., D. Hansen, J., R.

Ice Safety At the Canadian Ice Service (CIS), our mission is to provide the most accurate and timely information about ice in Canada's navigable waters. We work to promote safe and efficient maritime operations and to help protect Canada's environment. For the latest ice conditions, click the appropriate regional area on the map. Arctic Ocean | Western Arctic | Eastern Arctic | Hudson Bay | East Coast | Great Lakes Full Resolution Map | Animated Map (last 10 days) This map displays the latest ice cover in Canadian waters. To learn more about our products and how to interpret them, take a look at our Ice Products Guide. Arctic Sea Ice News & Analysis The sea ice extent has been quickly growing, and by the end of October, ice covered most of the Arctic Ocean. Overall, the ice extent remained below average for this time of year in the Barents and Kara Seas, as well as within northern Baffin Bay and the East Greenland Sea. Overview of conditions Figure 1. Arctic sea ice extent for October 2021 was 6.77 million square kilometers (2.61 million square miles). Credit: National Snow and Ice Data CenterHigh-resolution image The monthly average extent for October 2021 was 6.77 million square kilometers (2.61 million square miles). Conditions in context Figure 2a. Credit: National Snow and Ice Data CenterHigh-resolution image Figure 2b. Credit: NSIDC courtesy NOAA Earth System Research Laboratory Physical Sciences Laboratory High-resolution image Figure 2c. Credit: NSIDC courtesy NOAA Earth System Research Laboratory Physical Sciences Laboratory High-resolution image October 2021 compared to previous years Figure 3. Figure 4. Figure 5. References

On temperature and CO2 in the past Posted on 29 May 2010 by Riccardo Guest post by Riccardo One of the most famous paleoclimate graphs for "amateur climatologists" like me is the Vostok ice core reconstructions of temperature and CO2 concentration over the last 420 kyr. It shows how nicely the two follow each other and that our climate has overall "oscillated" within two relatively well defined limits. One may wish to look at this correlation a little better. Fig. 1: Dome C temperature and CO2 concentration data (dots) with the best fit line (red line). This graph shows how our climate system behaves naturally. This concept is made explicit in a recent paper (Etkin 2010) where the author makes a state-space (or phase-space) analysis of ice cores and recent instrumental measurements. Fig. 2: State-space plot of the Vostok, EPICA and Law Dome ice core data and Mauna Loa direct measurements. Masson-Delmotte et al. 2010 did something similar (and much more!). Fig. 3: EPICA Dome C data temperature anomaly vs.

Latest GRACE data on Greenland ice mass Posted on 28 May 2010 by John Cook I don't plan to fall into the trap of breathlessly reporting every twist and turn of short-term climate fluctuations (I went through a bit of a silly period in March and April 2008). But we've been discussing Greenland trends and as it's been over a year since posting GRACE data on Greenland ice mass so I figure we're due an update. Many thanks to Tenney Naumer of Climate Change: The Next Generation who emailed me the graph. Thanks also to John Wahr at the University of Colorado who analysed the GRACE data and granted permission to reproduce it here. Figure 1 below shows the latest satellite gravity measurements of the Greenland ice mass, through to February 2010 Figure 1: Greenland ice mass anomaly (black). This graph includes 12 months more data than Velicogna 2009 and shows the rate of ice mass loss is still increasing. Figure 2: Rate of ice loss from Greenland.

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