On 23/06/14 17:28, matt_sykes wrote:
On Monday, 23 June 2014 09:19:25 UTC-7, RedAcer wrote:
On 23/06/14 17:04, matt_sykes wrote:

On Monday, 23 June 2014 02:27:17 UTC-7, RedAcer wrote:

On 23/06/14 09:49, Joe Egginton wrote:















Don't wast your time reading Christopher Booker. Checkout NOAA
for

yourself



This is what NOAA say about adjusting their data: "There are
more

cold steps than warm, we don't know why, so we adjust it"





Sorry, you were saying?





It's all explained he-

http://www.ncdc.noaa.gov/oa/climate/research/ushcn/

Its explained better he
ftp://ftp.ncdc.noaa.gov/pub/data/ghc....0-29Aug12.pdf
"cold steps warm steps, we don't know why, but we adjust anyway" page
10.



Seems ok to me. Why not follow the references they give if you want to
get a better understanding. Also more explanation is given in the
reference I posted.

"As shown in Figure 1, more positive shifts (cold step changes) than
negative shifts (warm
step changes) were identified in both v3.1.0 and v3.2.0. Because there
are more negative (cold)
step changes than positive (warm) step changes identified in the
historical record, the bias
adjustment process results in global land surface air temperature trends
that are higher than those
based on unadjusted data. Furthermore, the greater rate of changepoint
detection in v3.2.0, and
the asymmetric nature of the changepoints, results in an even higher
global land surface trend
than v3.1.0. Although the reason for the larger number of cold step
changes is unclear, they may
be due in part to systematic changes in station locations from city
centers to cooler airport
locations (Lawrimore et al. 2011). The greater rate of changepoint
detection in v3.2.0 resulted in
a 1901-2011 global land surface temperature trend of 1.07°C/Century,
while the trend based on
v3.1.0 is 0.94°C/Century (Figure 4). The greatest differences between
the two versions occurred
before 1970, and there was little change in the global surface
temperature trend during the 1979-
2011 period; 0.274°C/Decade for v3.2.0 and 0.275°C/Decade for v3.1.0."