We also include an estimate from the NCAR LE of the impact of decadal variability
in precipitable water in the atmosphere, which can impact GMSL.
Looking at the global average change
in precipitable water doesn't really tell you much.
A recent study of water vapor trends above North America based on radiosonde measurements from 1973 to 1993 finds increases
in precipitable water over all regions except northern and eastern Canada, where it fell slightly.
The most recent global estimate shows an increase
in precipitable water during the period 1973 - 1990, with the largest trends in the tropics, where increases as large as 13 % per decade were found.
Not exact matches
The definitive
precipitable water vapour analyses are discussed
in Chapter 3 of AR4, and I'd start with those publications and authors to see what the differences are with the ISCCP product.
«This parameter represents the total
precipitable centimeters of water vapor
in the atmosphere and is determined from analysis of satellite infrared sounder data (NOAA operational analysis).
But all were extreme events, both
in terms of precipitation rates and of cost, of the sort which we expect to become much more frequent given both theory and observed metrics such as
precipitable water
in the atmosphere.
Precipitable water - The total amount of atmospheric water vapor
in a vertical column of unit cross-sectional area.
Here I have the Earth Null School site showing total
precipitable water
in the atmosphere.
Moreover, the amount of water
in the atmosphere, also known as the
precipitable water value, or PWAT, will be 1.50 to 1.75 inches.
Just to let you know how stupid the global warming activists are, I've been to the south pole 3 times and even there, where the water vapor is under 0.2 mm
precipitable, it's still the H2O that is the main concern
in our field and nobody even talks about CO2 because CO2 doesn't absorb or radiate
in the portion of the spectrum corresponding with earth's surface temps of 220 to 320 K. Not at all.
The storm is passing over waters of 29 °C — approximately 0.5 °C above average
in temperature — and is an unusually wet storm, with amounts of water vapor near the very high end of what is observed
in tropical cyclones (
precipitable water values up to 3.0 inches.)
States that
in recent decades, the midtroposphere (defined here as 600 - 400 hPa) has been warming faster
in the Arctic than
in the Northern Hemisphere midlatitudes; this warming has been accompanied by an increase
in Arctic
precipitable water
This image shows the total
precipitable water forecast to be
in the atmosphere at 11 a.m. on...
The mean distribution of
precipitable water, or total atmospheric water vapor above the Earth's surface, is shown
in Figure 2.
Implement a new total
precipitable water (TPW) predictor
in the SHIPS model to help account for the impact of dry layers (e.g. the SAL and mid-latitude dry air intrusions) on tropical cyclone intensity.
The variables I am interested
in are SST, surface air temperature,
precipitable water, precipitation rate, and Outbound Longwave Radiation (OLR).
Let's take «
precipitable water» (aka H2O,
in cm.).
dRH -0.038792717 0.011076382 -3.502291475 0.001197255 dAVWS -0.018380323 0.085040424 -0.216136302 0.83003757 And as before the main positive and significant determinant of changes
in annual mean temperature is «H2O»,
precipitable water (on which [CO2] has no discernible effect).
Your reply is frankly (and disappointingly) inadequate, because all the regressions I report show that by far the main effect on January temperatures
in New York from 1960 to 2006 was
precipitable water (aka H2O).