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Functions/Subroutines
AVIATION.f File Reference

Subroutines related to aviation. More...

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Functions/Subroutines

subroutine CALCAT (U, V, H, U_OLD, V_OLD, H_OLD, CAT)
 Computes Clear Air Turbulence Index. More...
 
subroutine CALCEILING (CLDZ, TCLD, CEILING)
 Computes ceiling. More...
 
subroutine CALFLTCND (CEILING, FLTCND)
 Computes Ceiling. More...
 
subroutine CALICING (T1, RH, OMGA, ICING)
 Computes In-Flight Icing. More...
 
subroutine CALLLWS (U, V, H, LLWS)
 Computes Low Level Wind Shear (0-2000feet) More...
 

Detailed Description

Subroutines related to aviation.

Definition in file AVIATION.f.

Function/Subroutine Documentation

subroutine CALCAT ( real, dimension(ista_2l:iend_2u,jsta_2l:jend_2u), intent(in)  U,
real, dimension(ista_2l:iend_2u,jsta_2l:jend_2u), intent(in)  V,
real, dimension(ista_2l:iend_2u,jsta_2l:jend_2u), intent(in)  H,
real, dimension(ista_2l:iend_2u,jsta_2l:jend_2u), intent(in)  U_OLD,
real, dimension(ista_2l:iend_2u,jsta_2l:jend_2u), intent(in)  V_OLD,
real, dimension(ista_2l:iend_2u,jsta_2l:jend_2u), intent(in)  H_OLD,
real, dimension(ista_2l:iend_2u,jsta_2l:jend_2u), intent(inout)  CAT 
)

Computes Clear Air Turbulence Index.

This program computes the Clear Air Turbulence condition which is expressed as Index with Ellrod Algorithm (Gary P. Ellrod: Wea. and Forecast,1992) and Ri number suggested by S. Silberberg of AWC. But Ri number is still not classified into 3 level CAT, so current version does not use Ri as suggested by S. Silberberg.

PROGRAM HISTORY LOG:

  • 05-09-19 H CHUANG - MODIFIED TO COMPUTE GRADIENTS FOR BOTH A AND E GRIDS

According to Ellrod, the CAT is classied into 3 levels (index):

  • Light: CAT = 1
  • Middle: CAT = 2
  • Severe: CAT = 3
  • No CAT: CAT = 0
Parameters
[in]UU wind profile (m/s) (at pressure level)
[in]VV wind (m/s) (at pressure level)
[in]HHeight (m) (at pressure level)
[in]U_OLDU wind profile (m/s) (at pressure level)
[in]V_OLDV wind (m/s) (at pressure level)
[in]H_OLDHeight (m) (at pressure level)
[in,out]CATCAT Index
Author
Binbin Zhou NCEP/EMC
Date
2005-08-16

Definition at line 264 of file AVIATION.f.

subroutine CALCEILING ( real, dimension(ista:iend,jsta:jend), intent(in)  CLDZ,
real, dimension(ista:iend,jsta:jend), intent(in)  TCLD,
real, dimension(ista:iend,jsta:jend), intent(inout)  CEILING 
)

Computes ceiling.

This program computes the ceiling. Definition: Ceiling is the cloud base height for cloud fraction > 50% The cloud base is from sea level in the model, while ceiling is from surface. If no ceiling, set ceiling height = 20000 m

Parameters
[in]CLDZCLOUD BASE HEIGHT from sea level(M)
[in]TCLDTOTAL CLOUD FRACTION (%)
[in,out]CEILINGCEILING HEIGHT from surface (m)
Author
Binbin Zhou NCEP/EMC
Date
2005-08-18

Definition at line 496 of file AVIATION.f.

subroutine CALFLTCND ( real, dimension(ista:iend,jsta:jend), intent(in)  CEILING,
real, dimension(ista:iend,jsta:jend), intent(inout)  FLTCND 
)

Computes Ceiling.

This program computes the flight condition restriction which is defined as follow (NOAA/NWS/Instruction for TAF, 2004):

Ceiling(feet)Visibility(miles) FLTCND
LIFR < 200 and/or < 1 1
IFR >= 500 to < 1000 and/or >=1 to < 3 2
MVFR >=1000 to <= 3000 and/or >=3 to <= 53
VFR > 3000 > 5 5
Parameters
[in]CEILING- CEILING HEIGHT from surface (m) NOTE: VIS - Visibility is passed through COMMON /VISB/
[in,out]FLTCND- FLIGHT CONDITION CATERGORY
Author
Binbin Zhou NCEP/EMC
Date
2005-08-18

Definition at line 550 of file AVIATION.f.

subroutine CALICING ( real, dimension(ista:iend,jsta:jend), intent(in)  T1,
real, dimension(ista:iend,jsta:jend), intent(in)  RH,
real, dimension(ista:iend,jsta:jend), intent(in)  OMGA,
real, dimension(ista:iend,jsta:jend), intent(inout)  ICING 
)

Computes In-Flight Icing.

This program computes the in-flight icing condition with the T-RH-OMGA algorithm provided by S. Silberberg of NCEP/AWC (improved new version).

According to S. Silberberg, Icing happens in following situation:

  1. -22C < T < 0C to
  2. RH > 70 %
  3. Ascent air, OMGA < 0
  4. Equivalent Potential Vorticity (EPV) < 0
  5. Cloud water if SLD (supercooled large droplet)

Current version dosn't consider SLD, so cloud water is not used. EPV computation is not available for current NCEP/EMC models(NAM, WRF, RSM), so EPV is also not used.

Parameters
[in]T1TEMPERATURE (K)
[in]RHRELATIVE HUMIDITY (DECIMAL FORM)
[in]OMGAVertical velocity (Pa/sec)
[in,out]ICINGICING CONDITION (1 or 0)
Author
Binbin Zhou NCEP/EMC
Date
2005-08-16

Definition at line 160 of file AVIATION.f.

subroutine CALLLWS ( real, dimension(im,jm,lsm), intent(in)  U,
real, dimension(im,jm,lsm), intent(in)  V,
real, dimension(im,jm,lsm), intent(in)  H,
real, dimension(im,jm), intent(inout)  LLWS 
)

Computes Low Level Wind Shear (0-2000feet)

This program computes the low level wind shear(LLWS) over 0-2000 feet (0-609.5m) layer. But because 10m wind represent sfc wind, 10-619.5 m layer is used. (NOAA/NWS Instruction 10-813, 2004)

Definition: LLWS(Z1,Z2) is vector difference of wind at z1 and z2 where:

  • Z1 = 10m + Surface height
  • Z2 = 619.5 + Surface height

Algorithm: since Z2 is not defined in the model, so, first thing is searching Z2 to see which layers it is located(ie between which two pressure levels), then find the wind vector (U2,V2)at Z2 by interpolating with the wind vectors of the at pressure levels above and below then compute the vector difference between Z2 and Z1 (ie U10,V10)

                               
      ----------------------------------------- K2-1 ---------------------
                            ^
                            |
                            |
                            |            
                 ____       |  _____ Z2, U2=interpo[U(K2),U(K2-1)]
                  ^         |            V2=interpo[V(K2),V(K2-1)]
                  |         |                       
      ------------|---------|------------------ K2 ------------------------
                  |         |
                  |         |DH=SUM of all layers between K1-1 & K2-1 
                  |         |                                            .              
                  |609.5m   |                                            .
                  |(2000ft) |                                            .
                  |         v
      ------------|---------------------------------------------------- LSM-2
                  |               ^
                  |               |ZH1   
                  |               |
                 o-o 10m       ___v__ Z1,U10,V10                 
       FIS    ....|.....          ^
        ^   .            .        |
      --|-------------------------|------------ K1 -------------------- LSM-1
        | .                .      |
        |.                  .     |
       .|                    ...  |
      --|-------------------------|------------------------------------- LSM
      . |                         |
     ////////////////////////////////////////////////////////////////// Sea Level
Parameters
[in]UU wind profile (m/s) (at pressure level).
[in]VV wind (m/s) (at pressure level).
[in]HHeight (m) (at pressure level).
[out]LLWSLow level wind shear (Knots/2000ft).

Program History

  • 19-10-30 Bo CUI - REMOVE "GOTO" STATEMENT
  • 21-04-01 Jesse Meng - computation on defined points only
Author
Binbin Zhou NCEP/EMC
Date
2005-08-16

Definition at line 65 of file AVIATION.f.