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Greenland -72C today
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Bernard Burton
Dec 6, 2011, 12:03:26 PM12/6/11
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Today's noaa19 overpass of Greenland at 1436z gave minimum surface
temperature of -72.1C near 72.3N 37.9W, about one degree down on yesterday's
values in mid afternoon and late evening, the latter sampled by the metop-a
satellite, confirming the noaa19 value earlier in the day.
Further to yesterday's discussion on USW, the channel used for these
measurements is the 11 micrometres IR channel 4. I think that the
calibration data for the IR sensor is transmitted by the satellite along
with the sensed data. I also think that these AVHRR instruments are capable
of onboard calibration, so I would not expect to see much error in these
measurements, especially as the principal source of error is contamination
of the upwelling radiation by intervening cloud, which is absent over
Greenland at the moment.
http://www.woksat.info/etctl06/tl06-1436-e-grn.html
--
Bernard Burton
Wokingham Berkshire.
Weather data and satellite images at:
http://www.woksat.info/wwp.html
temperature of -72.1C near 72.3N 37.9W, about one degree down on yesterday's
values in mid afternoon and late evening, the latter sampled by the metop-a
satellite, confirming the noaa19 value earlier in the day.
Further to yesterday's discussion on USW, the channel used for these
measurements is the 11 micrometres IR channel 4. I think that the
calibration data for the IR sensor is transmitted by the satellite along
with the sensed data. I also think that these AVHRR instruments are capable
of onboard calibration, so I would not expect to see much error in these
measurements, especially as the principal source of error is contamination
of the upwelling radiation by intervening cloud, which is absent over
Greenland at the moment.
http://www.woksat.info/etctl06/tl06-1436-e-grn.html
--
Bernard Burton
Wokingham Berkshire.
Weather data and satellite images at:
http://www.woksat.info/wwp.html
Eskimo Will
Dec 6, 2011, 12:20:00 PM12/6/11
to
"Bernard Burton" <b.j.b...@btinternet.com> wrote in message
news:9k7075...@mid.individual.net...
> Today's noaa19 overpass of Greenland at 1436z gave minimum surface
> temperature of -72.1C near 72.3N 37.9W, about one degree down on
> yesterday's values in mid afternoon and late evening, the latter sampled
> by the metop-a satellite, confirming the noaa19 value earlier in the day.
> Further to yesterday's discussion on USW, the channel used for these
> measurements is the 11 micrometres IR channel 4. I think that the
> calibration data for the IR sensor is transmitted by the satellite along
> with the sensed data. I also think that these AVHRR instruments are
> capable of onboard calibration, so I would not expect to see much error in
> these measurements, especially as the principal source of error is
> contamination of the upwelling radiation by intervening cloud, which is
> absent over Greenland at the moment.
>
> http://www.woksat.info/etctl06/tl06-1436-e-grn.html
>
Thanks Bernard, this is really most interesting. A student of mine many
> temperature of -72.1C near 72.3N 37.9W, about one degree down on
> yesterday's values in mid afternoon and late evening, the latter sampled
> by the metop-a satellite, confirming the noaa19 value earlier in the day.
> Further to yesterday's discussion on USW, the channel used for these
> measurements is the 11 micrometres IR channel 4. I think that the
> calibration data for the IR sensor is transmitted by the satellite along
> with the sensed data. I also think that these AVHRR instruments are
> capable of onboard calibration, so I would not expect to see much error in
> these measurements, especially as the principal source of error is
> contamination of the upwelling radiation by intervening cloud, which is
> absent over Greenland at the moment.
>
> http://www.woksat.info/etctl06/tl06-1436-e-grn.html
>
years ago presented a student lecture on the climate of Greenland (mainly
coastal, but a bit of the plateau). I do not have the notes but IIRC these
temperature values are very low for the time of year, exceptionally low? Not
sure. Anyone?
If they are exceptional then it will have an affect on our weather, not
directly of course, but synoptically.
Will
--
Dawlish
Dec 6, 2011, 3:03:46 PM12/6/11
to
On Dec 6, 5:20 pm, "Eskimo Will" <w...@lyneside.demon.co.uk> wrote:
> "Bernard Burton" <b.j.bur...@btinternet.com> wrote in message
Not really in the same area, but try this:
http://www.currentresults.com/Weather-Extremes/coldest-temperature-ever-recorded.php
> "Bernard Burton" <b.j.bur...@btinternet.com> wrote in message
http://www.currentresults.com/Weather-Extremes/coldest-temperature-ever-recorded.php
Bernard Burton
Dec 6, 2011, 6:38:20 PM12/6/11
to
"Dawlish" <pjg...@hotmail.com> wrote in message
news:fc1fbb40-7c0a-4b3f...@i6g2000vbh.googlegroups.com...
I didn't point this out before, but the temperature measured by the
satellite sensor is the ice surface value, and as we are all aware from
grass minimum thermometers over snow, the surface temperature can easily be
8C to 10C lower than the air temperature.
news:fc1fbb40-7c0a-4b3f...@i6g2000vbh.googlegroups.com...
satellite sensor is the ice surface value, and as we are all aware from
grass minimum thermometers over snow, the surface temperature can easily be
8C to 10C lower than the air temperature.
Weatherlawyer
Dec 7, 2011, 3:24:55 AM12/7/11
to
On Dec 6, 11:38 pm, "Bernard Burton" <b.j.bur...@btinternet.com>
wrote:
> http://www.currentresults.com/Weather-Extremes/coldest-temperature-ev...
with the heights involved at surface level there, it explains a lot.
> http://www.bom.gov.au/australia/charts/viewer/index.shtml?type=mslp-precip&tz=AEDT&area=SH&model=G
wrote:
>
> I didn't point this out before, but the temperature measured by the
> satellite sensor is the ice surface value, and as we are all aware from
> grass minimum thermometers over snow, the surface temperature can easily be
> 8C to 10C lower than the air temperature.
Ah, I have been puzzling the stability of Antarctica's system, coupled
> I didn't point this out before, but the temperature measured by the
> satellite sensor is the ice surface value, and as we are all aware from
> grass minimum thermometers over snow, the surface temperature can easily be
> 8C to 10C lower than the air temperature.
with the heights involved at surface level there, it explains a lot.
> http://www.bom.gov.au/australia/charts/viewer/index.shtml?type=mslp-precip&tz=AEDT&area=SH&model=G
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