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![Page 1: "Preliminary Results of Bio- Optical Measurements during ARMEX-II" Y. Pradhan, M Mohan, S. Nayak (SAC) D. Sengupta (IISc)](https://reader035.fdocuments.in/reader035/viewer/2022070412/5697bf721a28abf838c7e934/html5/thumbnails/1.jpg)
"Preliminary Results of Bio-Optical Measurements during
ARMEX-II"
Y. Pradhan, M Mohan, S. Nayak (SAC)
D. Sengupta (IISc)
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"Solar penetration in warm pool thermodynamics"
D. Sengupta (IISc), Y. Pradhan, M. Mohan, P.A. Geda, S. Nayak (SAC)
A. Lotliker(Goa Univ.)
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LiCOR
SAT.
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Total TOA SW radiation,[Watts m-2]
TOA Radiation in 300-700nm range,
[Watts m-2]
Fraction,[%]
1367 641 47%
WavelengthInterval in
nm
Radiationin Watts m-2
Fraction of Solar constant(1367 W m-2) percent
<400 119 08.7
400 – 700 522 38.2
700 – 1000 309 22.6
>1000 417 30.5
Source: Thekaekara, 1976
swQ700300Q R = Q300
700/Qsw
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70°E 72°E 74°E 76°E 78°E 80°E
8°N
10°N
12°N
14°N
1
23
4
5,6,7,8,9,10
12
13
11,14,15
In d ia
S L
A rab ianS ea
K och i
L a k sh ad w eep Is .
In d ian O cean
WARM POOL I CRUISE (MARCH) 2003
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Station
St. # Position [E/N] Date
01 74.00/12.66 March 14
02 72.70/12.07 March 15
03 72.20/11.87 March 15
04 71.75/09.98 March 16
05 72.65/08.28 March 17
06 72.66/08.28 March 17
07 72.65/08.28 March 17
08 72.65/08.28 March 18
09 72.66/08.29 March 18
10 72.66/08.28 March 18
11 74.45/09.19 March 19
12 75.33/09.63 March 19
13 76.00/07.89 March 20
14 74.50/09.21 March 21
15 74.50/09.21 March 23
Station locations of concurrent bio-optical and physical measurement locations (SK191)
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WARM POOL II CRUISE (MAY-JUN) 2003
Buoy and Stn. Locations (17-22 May 2003)
DS6 - 5 Mar - 31 Oct 2003
DS7 - 21 Apr - 31 Oct 2003
DS7A - 4 Mar - 29 Apr 2003
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17-M ay 18-M ay 19-M ay 20-M ay 21-M ay 22-M ay30.2
30.4
30.6
30.8
31.0
31.2
SS
T [
°C]
T ime
True SST (1-3 m )
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17-M ay 18-M ay 19-M ay 20-M ay 21-M ay 22-M ay34.6
34.8
35.0
35.2
35.4
Sal
init
y [p
su]
T ime
True Sal (1-3 m )
Tim e evo lution o f surface (w ith in 0-3 m ) sa lin ity around buoy location
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17-M ay 18-M ay 19-M ay 20-M ay 21-M ay 22-M ay21.2
21.4
21.6
21.8
Sig
ma_
thet
a [K
g/m
^3]
T ime
True density (1-3 m )
Tim e evo lution o f surface (w ith in 0-3 m ) density around buoy location
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17-M ay 18-M ay 19-M ay 20-M ay 21-M ay 22-M ay
5
10
15
20
25
30
35
40
45
50
Mix
ed L
ayer
Dep
th [
m]
T ime
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17-M ay 18-M ay 19-M ay 20-M ay 21-M ay 22-M ay0
50
100
150
200
E_n
et [
W/m
^2]
0.0
12.5
25.0
37.5
50.0
ML
D [
m]
E_net
M LD
12:00 AM 12:00 AM 12:00 AM 12:00 AM 12:00 AM 12:00 AM
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0
100
200
300
400
500
600
700
800
900
1000
Sho
rt W
ave
Flu
x [W
/m^2
]
Tim e
Surface SW flux [300-3300 nm ]
SW flux [300-700 nm ] beneath the surface
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18May 19May 20May
Qlat -139.4 -123.1 -101.4
Qsw 207.6 224.7 237.1
Qnet 17.0 50.0 85.6
Qpen 9.8 37.0 39.7
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0 20 40 60 80 100 120 140 160 180 200
0
20
40
60
80
100
120
Dep
th [
m]<E_net> [W /m^2]
E_net(z) = E_net(z=0) * exp (-z/18.2)
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34.80 35.00 35.20 35.40 35.60 35.80 36.0034.80 35.00 35.20 35.40 35.60 35.80 36.00
6 8 10 12 14 16 18 20 22 24 26 28 30 32
0
20
40
60
80
100
120
140
Dep
th [
m]
21 22 23 24 25 26 27 28
A ll (6 ) s ta tions w ith M LD less than 15m
21 22 23 24 25 26 27 28
0
20
40
60
80
100
120
140
A ll (11) sta tions w ith M LD greater than 35m
200
300
400
500
600
700
800
900
10006 8 10 12 14 16 18 20 22 24 26 28 30 32
200
300
400
500
600
700
800
900
1000
S igm a-theta
S alinity [psu]
T em perature [°C ]
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21 22 23 24 25
0
25
50
75
10021 22 23 24 25 21 22 23 24 25 21 22 23 24 25
22 24 26 28 30 32 22 24 26 28 30 32 22 24 26 28 30 32 22 24 26 28 30 32
34 35 36 34 35 36 34 35 36 34 35 36
C04: 18/05/03 [1115 hrs] W 06: 20/05/2003 [1200 hrs]E04: 19/05/03 [1130 hrs] C17: 21/05/03 [1130 hrs]
21 22 23 24 25
0
25
50
75
100
W 03: 19/05/03 [0306 hrs]
24 26 28 30 32
34 35 36
21 22 23 24 25
22 24 26 28 30 32
34 35 36
C10: 20/05/03 [0301 hrs]
21 22 23 24 25
S07: 21/05/03 [0338 hrs]
22 24 26 28 30 32
34 35 36
21 22 23 24 25
22 24 26 28 30 32
34 35 36
C03: 18/05/03 [0423 hrs]
0 100 200 300 0 100 200 300 0 100 200 300 0 100 200 300
Tem
p_S
[°C
]
E_n
et [W
/m^2
]
Tem
p [°
C]
Sal
inity
[psu
]
Den
[kg/
m^3
]
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17-M ay 18-M ay 19-M ay 20-M ay 21-M ay 22-M ay 23-M ay0
50
100
150
200
250
300
Ene
rgy
Flu
x ov
er 3
00-7
00 n
m [W
/m^2
]0 :00 0:00 0:00 0:00 0:00 0:00 0:00
10m Edown
10m Enet
30m Edown
30m Enet
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0:00 3:00 6:00 9:00 12:00 15:00 18:00 21:00 0:000
25
50
75
100
125
150
175
200
E_n
et @
ML
D [
W/m
^2]
0
20
40
60
ML
D [
m]
T ime [hrs]
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70°E 72°E 74°E 76°E 78°E 80°E
8°N
10°N
12°N
14°N
8°N
10°N
12°N
14°N
70°E 72°E 74°E 76°E 78°E 80°E
M ARCH (CLEAR SKY)
APRIL(CLEAR SKY)
M ARCH (ALL SKY)
APRIL(ALL SKY)
200 210 220 230 240 250 260 270 280 290 300
Shortwave radiation budgets for March and April (in both clear sky & all sky conditions) at the surface and in the atmosphere derived from 5 Years (Feb 1985 – Dec 1988) of ERBE measurements. The units are in W m-2 with contour intervals of 10. Original data were obtained from 2.5°2.5° gridded climatology provided by the International Research Institute (IRI) climate data centre.
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29
30
31
SS
T [
°C]
0.02
0.04
0.06
Ch
l-a
[ug
/l]
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Chl- a
temp
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Date Surface(300-3300m)
At MLD (300-
700nm)
Ed- (Just
beneath the
surface)
MLD/Surface
MLD/0- 0-/Surface
May 18 206.2 9.8 106.9 4.8% 9.2% 51.9%
May 19 222.5 37.0 122.2 16.6% 30.3% 54.9%
May 20 237.9 39.7 140.9 16.7% 28.2% 59.2%
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