da_qc_amsua.inc
References to this file elsewhere.
1 subroutine da_qc_amsua (i, nchan, ob, iv)
2
3 !---------------------------------------------------------------------------
4 ! Purpose: perform quality control for amsua data.
5 !---------------------------------------------------------------------------
6
7 implicit none
8
9 integer, intent(in) :: i ! sensor index.
10 integer, intent(in) :: nchan ! number of channel
11 type (y_type), intent(in) :: ob ! Observation structure.
12 type (ob_type), intent(inout) :: iv ! O-B structure.
13
14
15 ! local variables
16 integer :: n,scanpos,k,isflg,ios,fgat_rad_unit
17 logical :: lmix
18 real :: si
19 ! real :: satzen
20 integer :: ngood(nchan),nrej(nchan),nrej_omb_abs(nchan), &
21 nrej_omb_std(nchan), &
22 nrej_mixsurface,nrej_windowchanl, nrej_si, &
23 nrej_clw,nrej_topo,num_rad, num_proc_domain, &
24 nrej_limb
25
26 character(len=30) :: filename
27
28 if (trace_use) call da_trace_entry("da_qc_amsua")
29
30 ngood(:) = 0
31 nrej(:) = 0
32 nrej_omb_abs(:) = 0
33 nrej_omb_std(:) = 0
34 nrej_mixsurface = 0
35 nrej_windowchanl= 0
36 nrej_si = 0
37 nrej_clw = 0
38 nrej_topo = 0
39 nrej_limb = 0
40 num_rad = iv%ob_numb(iv%current_ob_time)%radiance(i)- &
41 iv%ob_numb(iv%current_ob_time-1)%radiance(i)
42 ! num_rad = iv%instid(i)%num_rad
43 num_proc_domain = 0
44
45 if (num_rad > 0) then
46
47 ! do n= 1, iv%instid(i)%num_rad ! loop for pixel
48 do n= iv%ob_numb(iv%current_ob_time-1)%radiance(i)+1, iv%ob_numb(iv%current_ob_time)%radiance(i)
49
50 if (iv%instid(i)%proc_domain(n)) &
51 num_proc_domain = num_proc_domain + 1
52
53 ! 0.0 initialise QC by flags assuming good obs
54 !---------------------------------------------
55 iv%instid(i)%tb_qc(:,n) = qc_good
56
57 ! a. reject all channels over mixture surface type
58 !------------------------------------------------------
59 isflg = iv%instid(i)%isflg(n)
60 lmix = (isflg==4) .or. (isflg==5) .or. (isflg==6) .or. (isflg==7)
61 if (lmix) then
62 iv%instid(i)%tb_qc(:,n) = qc_bad
63 if (iv%instid(i)%proc_domain(n)) &
64 nrej_mixsurface = nrej_mixsurface + 1
65 end if
66 ! b. reject channels 1~4 over land/sea-ice/snow
67 !------------------------------------------------------
68 if (isflg > 0) then
69 iv%instid(i)%tb_qc(1:4,n) = qc_bad
70 if (iv%instid(i)%proc_domain(n)) &
71 nrej_windowchanl = nrej_windowchanl + 1
72 end if
73
74 ! c. reject channels 13,14(above top model 10mb),15
75 !------------------------------------------------------
76 iv%instid(i)%tb_qc(13:15,n) = qc_bad
77
78 ! reject limb obs
79 !------------------------------------------------------
80 scanpos = iv%instid(i)%scanpos(n)
81 if (scanpos <= 3 .or. scanpos >= 28) then
82 iv%instid(i)%tb_qc(:,n) = qc_bad
83 if (iv%instid(i)%proc_domain(n)) &
84 nrej_limb = nrej_limb + 1
85 end if
86
87 ! satzen = rad%satzen
88 ! if (abs(satzen) > 45.) iv%instid(i)%tb_qc(:,n) = qc_bad
89
90 ! d. check precipitation
91 !-----------------------------------------------------------
92 if (ob%instid(i)%tb(1,n) > 0. .and. &
93 ob%instid(i)%tb(15,n) > 0.) then
94 si = ob%instid(i)%tb(1,n) - ob%instid(i)%tb(15,n)
95 if (si >= 3.) then
96 iv%instid(i)%tb_qc(:,n) = qc_bad
97 iv%instid(i)%cloud_flag(:,n) = qc_bad
98 if (iv%instid(i)%proc_domain(n)) &
99 nrej_si = nrej_si + 1
100 end if
101 end if
102
103 if (iv%instid(i)%clwp(n) >= 0.2) then
104 iv%instid(i)%tb_qc(:,n) = qc_bad
105 iv%instid(i)%cloud_flag(:,n) = qc_bad
106 if (iv%instid(i)%proc_domain(n)) &
107 nrej_clw = nrej_clw + 1
108 end if
109
110 ! 3.1 Estimate Cloud Liquid Water (CLW) in mm over sea
111 ! (Grody etal. 2001, JGR, Equation 5b,7c,7d,9)
112 !---------------------------------------------------------
113 ! if (isflg == 0) then
114 ! coszen = cos(iv%instid(i)%satzen(n))
115 ! d0 = 8.24-(2.622-1.846*coszen)*coszen
116 ! d1 = 0.754
117 ! d2 = -2.265
118 ! ts = iv%instid(i)%ts(n)
119 ! tb1 = ob%instid(i)%tb(1,n)
120 ! tb2 = ob%instid(i)%tb(2,n)
121 ! clw = coszen*(d0+d1*log(ts-tb1)+d2*log(ts-tb2))
122 ! clw = clw - 0.03
123 ! end if
124
125
126 ! e. check surface height/pressure
127 !-----------------------------------------------------------
128 ! sfchgt = ivrad%info(n)%elv
129 ! if (sfchgt >=) then
130 ! else
131 ! end if
132
133 if ((isflg .ne. 0) .and. (iv%instid(i)%ps(n) < 850.)) then
134 iv%instid(i)%tb_qc(5,n) = qc_bad
135 if (iv%instid(i)%proc_domain(n)) &
136 nrej_topo = nrej_topo + 1
137 end if
138
139 ! g. check iuse
140 !-----------------------------------------------------------
141 do k = 1, nchan
142 if (satinfo(i)%iuse(k) .eq. -1) &
143 iv%instid(i)%tb_qc(k,n) = qc_bad
144 end do
145
146 ! f. check innovation
147 !-----------------------------------------------------------
148 do k = 1, nchan
149
150 ! absolute departure check
151 if (abs(iv%instid(i)%tb_inv(k,n)) > 15.) then
152 iv%instid(i)%tb_qc(k,n) = qc_bad
153 if (iv%instid(i)%proc_domain(n)) &
154 nrej_omb_abs(k) = nrej_omb_abs(k) + 1
155 end if
156
157 ! relative departure check
158 if (abs(iv%instid(i)%tb_inv(k,n)) > 3.0*satinfo(i)%error_std(k)) then
159 iv%instid(i)%tb_qc(k,n) = qc_bad
160 if (iv%instid(i)%proc_domain(n)) &
161 nrej_omb_std(k) = nrej_omb_std(k) + 1
162 end if
163
164 ! final QC decsion
165 if (iv%instid(i)%tb_qc(k,n) == qc_bad) then
166 iv%instid(i)%tb_error(k,n) = 500.0
167 if (iv%instid(i)%proc_domain(n)) &
168 nrej(k) = nrej(k) + 1
169 else
170 if (iv%instid(i)%proc_domain(n)) &
171 ngood(k) = ngood(k) + 1
172 if (use_error_factor_rad) then
173 iv%instid(i)%tb_error(k,n) = &
174 satinfo(i)%error_std(k)*satinfo(i)%error_factor(k)
175 else
176 iv%instid(i)%tb_error(k,n) = satinfo(i)%error_std(k)
177 end if
178 end if
179 end do ! chan
180 end do ! end loop pixel
181 end if
182
183 ! Do inter-processor communication to gather statistics.
184 call da_proc_sum_int (num_proc_domain)
185 call da_proc_sum_int (nrej_mixsurface)
186 call da_proc_sum_int (nrej_windowchanl)
187 call da_proc_sum_int (nrej_si )
188 call da_proc_sum_int (nrej_clw)
189 call da_proc_sum_int (nrej_topo)
190 call da_proc_sum_int (nrej_limb)
191 call da_proc_sum_ints (nrej_omb_abs(:))
192 call da_proc_sum_ints (nrej_omb_std(:))
193 call da_proc_sum_ints (nrej(:))
194 call da_proc_sum_ints (ngood(:))
195
196 if (rootproc) then
197 if (num_fgat_time > 1) then
198 write(filename,'(a,i2.2)') trim(iv%instid(i)%rttovid_string)//'.qcstat_',iv%current_ob_time
199 else
200 filename = trim(iv%instid(i)%rttovid_string)//'.qcstat'
201 end if
202
203 call da_get_unit(fgat_rad_unit)
204 open(fgat_rad_unit,file=trim(filename),form='formatted',iostat=ios)
205 if (ios /= 0) Then
206 write(unit=message(1),fmt='(A,A)') 'error opening the output file ', filename
207 call da_error(__FILE__,__LINE__,message(1:1))
208 end if
209
210 write(fgat_rad_unit, fmt='(/a/)') ' Quality Control Statistics for '//iv%instid(i)%rttovid_string
211 write(fgat_rad_unit,'(a20,i7)') ' num_proc_domain = ', num_proc_domain
212 write(fgat_rad_unit,'(a20,i7)') ' nrej_mixsurface = ', nrej_mixsurface
213 write(fgat_rad_unit,'(a20,i7)') ' nrej_windowchanl = ', nrej_windowchanl
214 write(fgat_rad_unit,'(a20,i7)') ' nrej_si = ', nrej_si
215 write(fgat_rad_unit,'(a20,i7)') ' nrej_clw = ', nrej_clw
216 write(fgat_rad_unit,'(a20,i7)') ' nrej_topo = ', nrej_topo
217 write(fgat_rad_unit,'(a20,i7)') ' nrej_limb = ', nrej_limb
218 write(fgat_rad_unit,'(a20)') ' nrej_omb_abs(:) = '
219 write(fgat_rad_unit,'(10i7)') nrej_omb_abs(:)
220 write(fgat_rad_unit,'(a20)') ' nrej_omb_std(:) = '
221 write(fgat_rad_unit,'(10i7)') nrej_omb_std(:)
222 write(fgat_rad_unit,'(a20)') ' nrej(:) = '
223 write(fgat_rad_unit,'(10i7)') nrej(:)
224 write(fgat_rad_unit,'(a20)') ' ngood(:) = '
225 write(fgat_rad_unit,'(10i7)') ngood(:)
226
227 close(fgat_rad_unit)
228 call da_free_unit(fgat_rad_unit)
229 end if
230
231 if (trace_use) call da_trace_exit("da_qc_amsua")
232
233 end subroutine da_qc_amsua
234
235