• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • Skip to footer

RealClimate

Climate science from climate scientists...

  • Home
  • Start here
  • Contributors
  • Archives
You are here: Home / 2015 / Archives for March 2015

Archives for March 2015

A hypothesis about the cold winter in eastern North America + Update

30 Mar 2015 by Stefan

The past winter was globally the warmest on record. At the same time it set a new cold record in the subpolar North Atlantic – and it was very cold in the eastern parts of North America. Are these things related?

Two weeks ago NOAA published the following map of temperature anomalies for the past December-January-February (i.e. the Northern Hemisphere winter). One week ago, we published a paper in Nature Climate Change (which had been in the works for a few years) arguing that the cold in the subpolar North Atlantic is indicative of an AMOC slowdown (as discussed in my last post). Immediately our readers started to ask (as we indeed had been asking ourselves): does the cold winter in eastern North America (culminating in the Inhofe snowball incident) have anything to do with what is going on in the Atlantic?

Winter15NOAAFig. 1 Temperature anomaly map for the past december-january-february, from NOAA.

[Read more…] about A hypothesis about the cold winter in eastern North America + Update

References

  1. S. Rahmstorf, J.E. Box, G. Feulner, M.E. Mann, A. Robinson, S. Rutherford, and E.J. Schaffernicht, "Exceptional twentieth-century slowdown in Atlantic Ocean overturning circulation", Nature Climate Change, vol. 5, pp. 475-480, 2015. http://dx.doi.org/10.1038/nclimate2554

Filed Under: Climate impacts, Climate Science, Oceans

What’s going on in the North Atlantic?

23 Mar 2015 by Stefan

The North Atlantic between Newfoundland and Ireland is practically the only region of the world that has defied global warming and even cooled. Last winter there even was the coldest on record – while globally it was the hottest on record. Our recent study (Rahmstorf et al. 2015) attributes this to a weakening of the Gulf Stream System, which is apparently unique in the last thousand years.

The whole world is warming. The whole world? No! A region in the subpolar Atlantic has cooled over the past century – unique in the world for an area with reasonable data coverage (Fig. 1). So what’s so special about this region between Newfoundland and Ireland?

Rahmstorf_2015_1rc

Fig. 1 Linear temperature trend from 1900 to 2013. The cooling in the subpolar North Atlantic is remarkable and well documented by numerous measurements – unlike the cold spot in central Africa, which on closer inspection apparently is an artifact of incomplete and inhomogeneous weather station data.

[Read more…] about What’s going on in the North Atlantic?

Filed Under: Climate Science

Climate Sensitivity Week

22 Mar 2015 by Gavin

Some of you will be aware that there is a workshop on Climate Sensitivity this week at Schloss Ringberg in southern Germany. The topics to be covered include how sensitivity is defined (and whether it is even meaningful (Spoiler, yes it is)), what it means, how it can be constrained, what the different flavours signify etc. There is an impressive list of attendees with a very diverse range of views on just about everything, and so I am looking forward to very stimulating discussions.

[Read more…] about Climate Sensitivity Week

Filed Under: Aerosols, Climate modelling, Climate Science, Greenhouse gases, Instrumental Record, IPCC, Paleoclimate, statistics

Severe Tropical Cyclone Pam and Climate Change

18 Mar 2015 by Stefan

Guest post by Kerry Emanuel

In the past 16 months, two exceptionally intense tropical cyclones, Haiyan and Pam, have struck the western Pacific with devastating effect. Haiyan may have had the highest wind speeds of any tropical cyclone on record, but we will never know for sure because we do a poor job estimating the intensity of storms that are not surveyed by aircraft. (Currently, only North Atlantic tropical cyclones are routinely reconnoitered by aircraft, and only if they threaten populated regions within a few days.) Pam’s analyzed intensity puts it within 10 knots of the most intense storms on record in the South Pacific, but here again this is within the error bars of satellite-derived intensity estimates.
pam2

[Read more…] about Severe Tropical Cyclone Pam and Climate Change

Filed Under: Climate Science, Hurricanes

Unforced variations: March 2015

6 Mar 2015 by group

This month’s open thread. We’ve burned out on mitigation topics (again), so please focus on climate science issues this month…

Filed Under: Climate Science, Open thread

Primary Sidebar

Email Notification

get new posts sent to you automatically (free)
Loading

Recent Posts

  • Some new CMIP6 MSU comparisons
  • How not to science
  • Unforced variations: March 2023
  • The established ground and new ideas
  • 2022 updates to model-observation comparisons
  • Unforced variations: Feb 2023

Our Books

Book covers
This list of books since 2005 (in reverse chronological order) that we have been involved in, accompanied by the publisher’s official description, and some comments of independent reviewers of the work.
All Books >>

Recent Comments

  • Mike on 2022 updates to model-observation comparisons
  • Mike on 2022 updates to model-observation comparisons
  • Mike on 2022 updates to model-observation comparisons
  • Mike on 2022 updates to model-observation comparisons
  • Adam Lea on Unforced variations: March 2023
  • Mike on 2022 updates to model-observation comparisons
  • Ron R. on Unforced variations: March 2023
  • Carbomontanus on Unforced variations: March 2023
  • macias shurly on How not to science
  • jgnfld on Unforced variations: March 2023
  • macias shurly on Some new CMIP6 MSU comparisons
  • macias shurly on Unforced variations: March 2023

Footer

ABOUT

  • About
  • Translations
  • Privacy Policy
  • Contact Page
  • Login

DATA

  • Data Sources
  • Climate model projections compared to observations

INDEX

  • Acronym index
  • Index

Realclimate Stats

1,296 posts

8 pages

230,119 comments

Copyright © 2023 · RealClimate is a commentary site on climate science by working climate scientists for the interested public and journalists.