Klimarealisterne slår til igen mod GISS/GHCN

Jeg har nu været rigtig mange målestationer igennem men det har ikke været mulig at finde noget korrektion for urban heat island effect de sidste 30 år

A new study published in the ISPRS Journal of Photogrammetry and Remote Sensing presents clear-sky surface UHI (SUHI) intensities for 497 urbanized areas in the United States by combining remotely-sensed data products with multiple US census-defined urban areas.

The SUHI intensity is the difference in surface temperature between the built-up and non-built up pixels of an urbanized area.

The study reported that the daytime summer SUHI was 1.91 °C higher and the daytime winter SUHI was 0.87 °C higher

kfl skrev:
GISS V4 har indarbejdet UHI i deres homogeniserins algoritme og så Reykjavik. Se Giss hjemmeside.

Peder Kruse skrev:
UHI er et direkte udtryk for det store menneskeforårsagede energiforbrug

UHI er en lokalt stærkt varierende del af den menneskeskabte globale opvarmning. Den kan/skal ikke kompenseres væk, men skal indgå med naturlig geografisk vægtning på linie med landmålerne i det globale temperaturgrid.

Discussion

It is maintained that homogenisation does not significantly distort the global temperature record although it has added about 0.3˚C warming, mainly through cooling the distant past. If homogenisation makes such little difference, why do it? This simply serves to sow suspicion in sceptical minds. Whilst at one level I can accept the need to correct records where a justifiable cause is identified and understood. I find it equally hard to accept that automated wholesale adjustment is justified. I would like to hear the physical science explanation for adjustments made to the Sydney record posted up top.

kfl skrev:
WMO dyrker homogenisering af temperatur serier med møder konferencer etc.
Det er et stort emne.

Dette fremgår af følgende link

WMO:Climate data homogenization

WMO:GUIDELINES ON CLIMATE METADATA AND HOMOGENIZATION ,side 1 - 50

Det er mere end pinligt for Prof Ole Humlum med hans angreb på GISS. Dette angreb vise, hvor uvidende han er og for resten hele gruppen af klimaskeptikere.

Darwin
The current site (14015) is located on the southern edge of Darwin Airport, about 7 km northeast of the central city and well away from any parts of suburban Darwin. It is over natural grass with some shrubs about 20 m away to the west and east.

History
Earlier observations were made at the Post Office (14016), in the central city area. This is on a peninsula in Darwin Harbour which means that the prevailing dry-season southeasterlies have a trajectory over Darwin Harbour (whereas at the airport they are over land). The site deteriorated progressively from the mid-1930s, becoming overshadowed by trees, especially after 1937. The site (along with the remainder of the Post Office) was destroyed in the Japanese air raids of February 1942 and never rebuilt.

The airport site (14015) has been operating since February 1941. An automatic weather station was installed on 1 October 1990 and became the primary instrument on 1 November 1996. The site moved about 900 m east (along the southern edge of the airport) on 7 August 2001, with observations at the original site continuing under the station number 14040 until June 2007. No significant temperature changes were found between these two sites.

Peter Villadsen skrev:
Satellitmålingerne er gennemsnitstemperaturer målt i atmosfæren langt over jordens overflade.
NASA GISStemp er målestationer, der står på jordoverfladen.

Det er en markant forskel og resultaterne er da også forskellige.

delphi skrev:
Vi taler her om temperaturindexer. Temperaturudviklingen skulle følge hinanden hvis ikke det var for GISS' forfalskning af data

Topics
The homogeneous data series with high quality and the spatial interpolation are indispensable for the climatological and meteorological examinations. The primary goal of this meeting is to promote the discussion about the methodological and theoretical aspects.

The main topics of homogenization and quality control are intended to be the following:

Methods for homogenization and quality control of monthly data series
Spatial comparison of series, inhomogeneity detection, correction of series
Methods for homogenization and quality control of daily data series, examination of parallel measurements
Relation of monthly and daily homogenization, mathematical formulation of homogenization for climate data series generally
Theoretical evaluation and benchmark for methods, validation statistics
Applications of different homogenization and quality control methods, experiences with different meteorological variables
Climate monitoring products
The main topics of spatial interpolation are the following:

Temporal scales: from synoptic situations to climatological mean values
Interpolation formulas and loss functions depending on the spatial probability distribution of climate variables
Estimation and modelling of statistical parameters (e.g.: spatial trend, covariance or variogram) for interpolation formulas
using spatiotemporal sample and auxiliary model variables (topography)
Use of auxiliary co-variables, background information (e.g.: dynamical model results, satellite, radar data) for
spatial interpolation (data assimilation, reanalysis)
Applications of different interpolation methods for the meteorological and climatological fields
Gridded databases, gridded climate monitoring products, digital climate atlases, climate normals
Publication of the papers in a proceedings in the serial WMO/WCP/WCDMP is foreseen after the meeting.

Peter Villadsen skrev:
Hvordan mon benægteren forklarer, at alle datasets, der ikke er måling i troposfæren som UAH, viser samme opvarmning som GISStemp?

Jørgen Petersen skrev:
Glem ikke at både IPCC og de såkaldte klimaforskere har en stor interesse i at overdriver problemerne. Jeg vi gå så langt som at sige, at det totalt ubegavet, hvis man ukritisk godtager alt hvad IPCC og de såkaldte klimaforskere siger og skriver. Det handler ikke om viden, men om troværdighed, ærlighed og objektivitet.

Derimod er det interessant at lytte til dem, der evner at oplyse andre om klodens tilstand.