Monday, March 5, 2012

2366.txt

cc: m.haylockatXYZxyz.ac.uk, mark.newatXYZxyze.ox.ac.uk
date: Mon Aug 22 16:59:40 2005
from: Phil Jones <p.jonesatXYZxyz.ac.uk>
subject: Russian daily precipitation data
to: Lisette Klok <klokatXYZxyzi.nl>, Albert.Klein.TankatXYZxyzi.nl

Albert and Lisette,
Malcolm forwarded me the maps. The coverage is looking very
good. Seeing all the stations over Russia and fUSSR got me
thinking about another series of emails that came last week when
I was away. In EMULATE we've noticed a lot of problems
with the long-term homogeneity of fUSSR precip data,
before 1967.
The two emails below are to Anders and Alex (of EMULATE)
asking them to download this new corrected dataset from
Pasha Groisman. This will be available from Sept 1 2005.
I have got it earlier from Tom Peterson with download
instructions. I would suggest that you also get this dataset
for ENSEMBLES.
We should be making use of these improvements to the
database, despite the hassle of pairing off the stations
across the fUSSR. I know these data are no longer as measured,
but they have been modified by the best person (Groisman)
whoshould know what he's doing.
Cheers
Phil
PS to Albert - I suspect this affects our ..stans from the Pune
meeting, but let's ignore that. There wasn't too much
happening on the large scale for precip.
Anders, Alex,
With these instructions and ftp site you should be
able to get the daily Russian precip data. Can one of you
download this lot as David is aware here this week and next?
I suspect you will get many more stations than we
will need, but hopefully you will be able to replace
all the precip data for our sites in Russia.
If there are any problems or issues get back to Tom
directly and cc to me. The data has also gone to Lisa
and Xuebin Zhang, so we have gained about 10 days
getting it earlier.
One final thing, I suspect this problem with Russian
precip applies to all the other fUSSR stations as well.
David saw problems with Kiev in some examples the week
before last. So check all these as well.
Cheers
Phil

Date: Mon, 22 Aug 2005 08:52:37 -0400
From: "Thomas C Peterson" <Thomas.C.PetersonatXYZxyza.gov>
User-Agent: Mozilla Thunderbird 1.0.6 (Windows/20050716)
X-Accept-Language: en-us, en
To: Phil Jones <p.jonesatXYZxyz.ac.uk>
Subject: Re: Russian daily precipitation data
X-UEA-Spam-Score: 0.1
X-UEA-Spam-Level: /
X-UEA-Spam-Flag: NO
Dear Phil,
I talked to Pasha about his data Friday. From what I can gather, Pasha homogeneity
adjusted Russian precip several years ago in collaboration with a colleague back in
Russia. These had adjustments to account for the installation of the windshield in the
1950s, the change in how they handled wetting (the liquid remaining in the gauge after
puring it into the measuring devise) and the impact of changing the number of
observations per day in the 1980s on the wetting adjustment. The windshield adjustment
was just a factor applied to all stations for all observations.
These are the data I've recommended we use in the Lisa et al. extremes paper. I
reformatted them based on the flags & using the output from one of Pasha's directories
Friday. I put them on our ftp site and sent Lisa & Xuebin the following message:
I've reformatted the files to simple YYYY MM DD mm. The units are millimeters. The
precision is 10ths of mm. However, when the precip was listed as 0 but it had the trace
flag, I made the precip 0.01 mm. Missing is -99.90.
You should be able to get the file via our ftp:
[1]ftp://ftp.ncdc.noaa.gov/pub/download/ussr.adj.dly.Z
I tarred the file and then compressed it when I saw how big it was. So first uncompress
then untar (tar -xf). These were done on our lynux workstations. Pasha's data set that
he is making available the end of the month has raw data, this version, and then an
"unbiased" version. So the proper reference to these data would be in Pasha's new data
set. All I'm doing is giving you a week jump on the data this part is available.
----
I should note that the inventory file I included had more stations than the number with
daily data that I included in the tar file. I also was a little rushed Friday, so
please let me know if anything is amiss with the data.
Now, regarding Pasha's new data set. He says that will be available the end of the
month. He doesn't want anyone to have access to it yet as he is double checking
things. He also seems to be somewhat concerned about the reception it will have, or so
I gathered, as he told me the story: "How do you recognize the first pioneers? By the
arrows in their backs." This dataset is "unbiased". That means he and a different
Russian colleague adjusted the data to be equivalent to what actually fell (e.g.,
accounting for wind induced under catch). The windshield adjustments are based on the
actual wind speed during the storm events. Temperature and humidity are used as well.
In blizzard conditions, the catch is lowered to account for blowing surface snow getting
in the gauge. Lower than blizzard wind speed generally has the catch increased. Trace
precip varies due to some formula but I saw values where trace was turned into 2 mm or 4
mm or (if memory serves) 0 mm. If adequate wind data was not present, the value of the
valid precip measurement was set to missing. The data include daily and sub-daily
amounts. This dataset may be a giant leap forward in some ways, but I personally would
like to see the some analyses from it (which I often think of as post-production quality
assurance testing) before I jumped into using it. Knowing Pasha, I expect those studies
will be published fairly quickly.
If you have any questions, please let me know.
Regards,
Tom
Phil Jones wrote:

Tom,
Is it possible that you might help us get this daily Russian precipitation
dataset any sooner? It will be called td-9813. The EMULATE project will
run until the end of the year and we would be keen to get it sooner rather than
later.
Cheers
Phil

Hi Anders,

Thanks for all the info. I have asked Tom Peterson to get a copy of the corrected
dataset (he is co-author with me on a global extremes paper that has just been accepted
in JGR). We access a couple of different sources for Russian data and do our own qc and
homogeneity tests on the data so I hope that this new information will only have a
minimal impact but it is important to know about it.

It would have been nice to know about this sooner (Tom sits only a few desks away from
Pasha) but I can understand that sometimes internal communication is harder than
external communication!

Cheers.

Lisa.

-----Original Message-----
From: Anders Moberg [[2]mailto:andersatXYZxyzu.su.se]
Sent: Wednesday, 17 August 2005 8:01 PM
To: Lisa Alexander
Subject: Fwd: Re: Russian precipitation data

Lisa,
Here is a copy of the mail I got from Pasha Groisman (I did not send out a copy of this
to EMULATE, but I thought you could be interested in reading his answer directly).
This is the last message in this little series
Cheers,
Anders
Date: Tue, 16 Aug 2005 08:34:21 -0400
From: "Pasha Groisman" [3]<Pasha.GroismanatXYZxyza.gov>
User-Agent: Mozilla Thunderbird 1.0.6 (Windows/20050716)
X-Accept-Language: en-us, en
To: Anders Moberg [4]<andersatXYZxyzu.su.se>
Subject: Re: Russian precipitation data
X-Virus-Scanned: by amavisd-new at av-in.su.se
Dear Anders:
The description of this archive is attached. NCDC service should be able to assist you
to get the data set. We have prepared a new data set (td-9813) that will be publicly
available very soon (its description, a short version is also attached)..
. How to Order Data:
The data are distributed free of charge for use with a non-commercial purposes
according to regulations outlined in WMO resolution 40. Contact NCDC's Climate Services
about costs of copying of the off-line version of this dataset.
Phone 828 271-4800
Fax 828-271-4876
e-mail [5]NCDC.OrdersatXYZxyza.gov
7. Archiving Data Center:

Name: National Climatic Data Center/NCDC
Address: Federal Building
151 Patton Ave.
Asheville, NC 28801 5001
Phone: 828-271-4800
Fax 828-271-4876
e-mail [6]NCDC.OrdersatXYZxyza.gov
Pasha
Anders Moberg wrote:
Dear Pasha,
I am writing concerning long daily Russian (fUSSR) precipitation series, which you have
written extensively about. I am a meteorologist at Stockholm University. Currently, I am
involved in an EU-project called EMULATE which is coordinated by Phil Jones (CRU, Univ.
East Anglia, UK). One component in EMULATE is to build a database with daily temperature
and precipitation series for as many European sites as possible with data starting 1900
or earlier. We collect data from various sources, both through personal contacts,
through digitization of original data within the project, and by using publicly
available data.
For the fUSSR region, our main data source has been the 223 station series in the
NDP-040 dataset by Razuvaev et al. 1993, with subsequent updates obtained by Lisa
Alexander at the Hadley Center (HC is also in EMULATE). We are aware of the various
homogeneity problems with the precip data (relating to the corrections K1 and K3 etc.)
that you have discussed in the literature.
Is it possible to get access to your corrected version of the daily precip series? In
your paper with Esfir Rankova in IJC (2001, vol. 21, p. 657-678) you mention that data
are "available from the NCDC website for the 1891-1999 period (TD-3720)". I can,
however, not find these data on the website. Could you help me/us to somehow get access
to the data? Using homogenized Russian series instead of the original data would of
course be a great improvement to our database.
Hope you can help us in some way,
If you are interested in more details about EMULATE, there are some on
[7]http://www.cru.uea.ac.uk/cru/projects/emulate/
With kindest regards,
Anders Moberg
------------------------------------------------------
Anders Moberg
Associate Professor (Docent)
Department of Meteorology
Stockholm University
SE-106 91 Stockholm, Sweden
phone: +46 8 16 4349
fax. +46 8 15 7185
[8]andersatXYZxyzu.su.se [9]http://www.misu.su.se/

--

Pavel Ya. Groisman, Ph.D.

UCAR Project Scientist at NCDC

National Climatic Data Center

151 Patton Avenue, Asheville, NC 28801, USA

Ph. +1 (828) 271-4347; Fax: +1 (828) 271-4328

Office e-mail: [10]Pasha.GroismanatXYZxyza.gov

Home e-mail: [11]Pasha.GroismanatXYZxyzecpc.com

Prof. Phil Jones
Climatic Research Unit Telephone +44 (0) 1603 592090
School of Environmental Sciences Fax +44 (0) 1603 507784
University of East Anglia
Norwich Email [12]p.jonesatXYZxyz.ac.uk
NR4 7TJ
UK
----------------------------------------------------------------------------


--
Thomas C. Peterson, Ph.D.
Climate Analysis Branch
National Climatic Data Center
151 Patton Avenue
Asheville, NC 28801
Voice: +1-828-271-4287
Fax: +1-828-271-4328

Prof. Phil Jones
Climatic Research Unit Telephone +44 (0) 1603 592090
School of Environmental Sciences Fax +44 (0) 1603 507784
University of East Anglia
Norwich Email p.jonesatXYZxyz.ac.uk
NR4 7TJ
UK
----------------------------------------------------------------------------

No comments:

Post a Comment