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Home — Metadata: Berkeley land ocean temperature

Metadata

Berkeley land ocean temperature
References
official web page http://www.berkeleyearth.org
Climate Explorer URLclimexp.knmi.nl/getindices.cgi?WMO=BerkeleyData/t2m_land_ocean_best&STATION=Berkeley_land_ocean_temperature
Climate Explorer filenameBerkeleyData/t2m_land_ocean_best.dat
Variable
nameT2m_anom
unitsK
long_nameglobal mean temperature anomalies relative to 1951-1980
Ascii global metadata
description Land temperature from Berkeley Dataset, , ocean temperature reinterpolated from HadSST, temperature over sea ice extrapolated from land., T2m anom [K] global mean temperature anomalies relative to 1951-1980,
institution Berkeley Earth Surface Temperature Project
source_url berkeleyearth.org/data/
history retrieved Tue Apr 11 04:49:19 AM GMT 2023
comment This file contains a detailed summary of the changes in Earth's global averagesurface temperature estimated by combining the Berkeley Earth land-surfacetemperature field with a reinterpolated version of the HadSST ocean temperature field. The current citation for this dataset is: Rohde, R. A. and Hausfather, Z.: The Berkeley Earth Land/Ocean Temperature Record, Earth Syst. Sci. Data, 12, 3469�3479, doi.org/10.5194/essd-12-3469-2020, 2020.The dataset differs slightly from the dataset as described in the citation as HadSST3 has been replaced with the newer HadSST4, and associated interpolation parameters have been refit accordingly. No other changes in methods were needed when moving to the new version of HadSST. Two versions of this average are reported. These differ in how they treat locations with sea ice. In the first version, temperature anomalies in the presence of sea ice are extrapolated from land-surface air temperature anomalies. In the second version, temperature anomalies in the presence of sea ice areextrapolated from sea-surface water temperature anomalies (usually collected from open water areas on the periphery of the sea ice). For most of the ocean, sea-surface temperatures are similar to near-surface air temperatures; however, air temperatures above sea ice can differ substantially from the water below the sea ice. The air temperature version of this average shows larger changes in the recent period, in part this is because water temperature changes are limited by the freezing point of ocean water. We believe that the use of airtemperatures above sea ice provides a more natural means of describing changes in Earth's surface temperature. The percent coverage of sea ice was taken from the HadISST v2 dataset and varies by month and location. In the typical month, between 3.5% and 5.5% of the Earth's surface is covered with sea ice. For more information on the processing and use of HadISST and HadSST refer to the description file for the combined gridded data product. Temperatures are in Celsius and reported as anomalies relative to the Jan 1951-Dec 1980 average. Uncertainties represent the 95% confidence interval for statistical and spatial undersampling effects as well as ocean biases.The land analysis was run on 05-Mar-2023 08:24:35The ocean analysis was published on 22-Mar-2023 05:21:28The land component is based on 50498 time series with 21093795 monthly data pointsThe ocean component is based on 457825113 instantaneous water temperature observations%Estimated Jan 1951-Dec 1980 global mean temperature (C) Using air temperature above sea ice: 14.104 +/- 0.021 Using water temperature below sea ice: 14.699 +/- 0.021As Earth's land is not distributed symmetrically about the equator, thereexists a mean seasonality to the global average temperature. Using air temperature above sea ice:Estimated Jan 1951-Dec 1980 monthly absolute temperature: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 12.24 12.45 13.06 13.98 14.95 15.67 15.95 15.78 15.19 14.25 13.24 12.50+/- 0.03 0.03 0.03 0.02 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.03 Using water temperature below sea ice:Estimated Jan 1951-Dec 1980 monthly absolute temperature: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 12.94 13.20 13.83 14.66 15.47 16.08 16.40 16.32 15.75 14.80 13.81 13.13+/- 0.02 0.02 0.03 0.02 0.02 0.03 0.02 0.02 0.02 0.02 0.02 0.02
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