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Questions tagged [reanalysis]

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How to calculate water vapor budget for a selected region in GRADS or MAT Lab

I need to calculate water vapor budget for a selected region. Can anyone suggest a specific link or code for the above mentioned tools please. I have seen a link for NCL but i am not familiar with ...
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0answers
39 views

Quantifying long term melt record on glacier surface

I intend to create a long term melt record on a glacier surface. What are parameters required to efficiently calculate the same using satellite, weather station observations & reanalysis datasets (...
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2answers
44 views

How can I account for rainfall effects on air pollution?

How can I adjust black carbon surface mass air pollution concentrations (ug/m3) for rainfall effects? Specifically, I have monthly and daily averaged black carbon pollution data (i.e. 2.0ug/m3 Jan ...
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1answer
35 views

Difference between NCEP's 20th Century daily Forecast and Analysis variables

NCEP's Twentieth Century Reanalysis (V2) provides daily variables from 1871/01/01 to 2012/12/31. Monolayer analysis variables are made available in a regular grid and forecast variables in a gaussian ...
4
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1answer
123 views

Single-layer water content variables

In different reanalysis products (ERA 20C and NOAA/OAR/ESRL/PSD 20th Century daily data specifically) one can find the following variables: Total column water (ERA) Total column rain water (ERA) ...
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2answers
88 views

ERA Interim problem with Waves

Has anyone had a problem with significant wave height (swh) and mean wave period (mwp) from ERA-Interim not matching very well with either a time series of measurements or a different model? Or does ...
3
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2answers
285 views

What's the difference between snow cover and fractional snow cover?

What's the difference between snow cover and fractional snow cover? Are they kind of synonyms? What would be a definition of fractional snow cover? thanks a lot!
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0answers
69 views

How are scatterometer observations standardised before being fed into reanalysis models?

This very basic question occurred to me during a talk on reanalysis data sets. Often we know the observations produced by a particular instrument, say rain radar, are biased from one year to the next ...
4
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1answer
402 views

How to calculate 3-hour flux values in ERA-Interim?

Referring to the post: https://www.myroms.org/forum/viewtopic.php?f=30&t=3003 I understood how to calculate the slhf and sshf for 03, 06, 09 and 12 time steps. But I have values for 00, 15, 18 ...
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1answer
164 views

CFSR hourly surface wind time series

I am looking for hourly surface wind reanalysis data for the past two years. I am looking at the CFSR/CFSv2 data accessible from UCAR: http://rda.ucar.edu/datasets/ds094.1 The 6-hourly products are "...
3
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1answer
3k views

ERA Interim, how to handle total precipitation

I am trying to compute accumulated annual precipitation for year 2000-2001 based on the ERA Interim, but I am stuck with some unresolved questions: If I download the synoptic monthly means of "total ...
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1answer
251 views

Why is radiation and total precipitation not available in ERA Interim Reanalysis at step 0?

ERA Interim reanalysis http://apps.ecmwf.int/datasets/data/interim-full-daily/levtype=sfc surface level variables such as radiation and precipitation, but also many others, are only available at time ...
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2answers
436 views

What is the meaning of step in ERA reanalysis data?

The webpage to download ERA data includes an option called "time" which is intuitive, but also an option called "step". I can't find an explanation of the meaning of this. It can't be a time step ...
5
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0answers
74 views

NCEP reanalysis latitude and longitude represent center of cell?

I can't find any information regarding the lat and long in the NCEP Reanalysis. Do they represent the center of the cell?
3
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1answer
771 views

shortwave and longwave radiation terminology, direct, beam, PAR, flux?

Some reanalysis data sets provide different components of shortwave radiation (near infrared and visible) and longwave. They are referred as radiation or flux. Also there is no mention of "direct" ...
5
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1answer
387 views

What is the height above ground of NCEP/NCAR Reanalysis 1 variables?

I am confused regarding the height above ground of this data set. http://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis.html I have to reprocess this data set and need to know this piece of ...
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1answer
225 views

Odd structures in 66 year NCEP daily temperature reanalysis

I have done some simple analyses of historical surface temperature from the NOAA NCAR/NCEP reanalysis (downloaded from ftp://ftp.cdc.noaa.gov/Datasets/ncep.reanalysis.dailyavgs/surface/air.sig995.*.nc)...