Look-up table data used in the GPM Spectral Latent Heating retrieval for the midlatitudes

Overview

This dataset contains the look-up table (LUT) data used for the midlatitude retrieval of the Global Precipitation Measurement (GPM) Spectral Latent Heating (SLH) V07 product. The LUTs that tie heating profiles to precipitation characteristics are constructed using Local Forecast Model simulations of eight extratropical cyclones around Japan. The LUTs for the following six categories: convective, shallow stratiform, downward increasing (DI) deep stratiform, downward decreasing (DD) deep stratiform, SUB0 (where the 0°C level is near the surface) deep stratiform, and OTHER. The precipitation top height (PTH) serves as an index for LUTs for convective and shallow stratiform, while the maximum precipitation rate (PMAX) is used as an index for LUTs for three deep stratiform and OTHER types. Note that LUTs for DD, DI, and SUB0 are subdivided based on whether the PMAX appears above or at the surface.

Contents

There are two directories named "data" and "fortran90".

In the directory named "data", there are the following nine files for each-type LUT:

  1.     Convective LUT: lut_convective _midlatSLH.grd

  2.     Shallow stratiform LUT: lut_shallow-stratiform _midlatSLH.grd

  3.     DD deep strtiform LUT with PMAX above the surface with: lut_DD-stratiform_pmaxABOVEsfc_midlatSLH.grd

  4.     DD deep strtiform LUT with PMAX at the surface with: lut_DD-stratiform_pmaxATsfc_midlatSLH.grd

  5.     DI deep strtiform LUT with PMAX above the surface with: lut_DI-stratiform_pmaxABOVEsfc_midlatSLH.grd

  6.     DI deep strtiform LUT with PMAX at the surface with: lut_DI-stratiform_pmaxATsfc_midlatSLH.grd

  7.     SUB0 deep strtiform LUT with PMAX above the surface with: lut_SUB0-stratiform_pmaxABOVEsfc_midlatSLH.grd

  8.     SUB0 deep strtiform LUT with PMAX at the surface with: lut_SUB0-stratiform_pmaxATsfc_midlatSLH.grd

  9.     OTHER LUT: lut_OTHER_midlatSLH.grd

The LUT data are in the plain binary format (single-precision real number, little endian).

The LUT values of latent heating, apparent heat source minus radiative heating, and apparent moisture sink are included in each file. Unit is K/h. 

The convective and shallow stratiform LUTs have 176 PTH bins and 176 vertical level bins, from the surface to 21.875 km at each 125 m.

On the other hand, the deep stratiform and OTHER LUTs have 35 PMAX bins defined as follows: 0.2–0.3, 0.3–0.7, 0.7–1, 1–1.5, 1.5–2, 2–2.5, 2.5–3, 3–4, 4–5, 5–6, 6–7, 7–8, 8–9, 9–10, 10–11, 11–12, 12–13, 13–14, 14–15, 15–16, 16–17, 17–18,18–19, 19–20, 20–21, 21–22, 22–23, 23–24, 24–25, 25–26, 26–27, 27–28, 28–29, 29–30, ≥30 mm/h. There are 353 vertical level bins for altitudes standardized by the level of PMAX, PTH, and precipitation bottom height, from -8.8 to 8.8 with an interval of 0.05.

Please see Yokoyama et al. (2024, J. Appl. Meteor. Climatol., under review) for details.

In the directory named "fortran90", there are two fortran90 programs to read the LUT data. The program named “read_lut_type-pth.f90” is for the convective and shallow stratiform LUTs, while the program named “read_lut_type-pmax.f90” is for the deep stratiform and OTHER LUTs.

The data would be updated.