J31 Data Workshop 9-10Mar05

Water Vapor during ICARTT 2004: Comparison of AATS-14, J31 in situ,

Ron Brown sonde measurements

NASA Ames Airborne Sunphotometer Team

SSFR Team

Presented by John Livingston

SRI International

JETSTREAM-31 during ICARTT 2004

Vaisala HMP243

AATS-14SSFR

• HMP243 consists of a heated composite humidity sensor head and an optional sensor head to measure ambient temperature

• Both probes mounted on the J31 during the ICARTT study

• Primary output is dewpoint, which is calculated within HMP243 from humidity and temperature readings of composite sensor

• Separate temp probe permits calculation of ambient relative humidity

• HMP243 outputs of ambient temperature, Ttotal, and relative humidity, RHVaisala, were recorded by SSFR data system

• Because the separate temperature probe is subject to dynamic heating effects, both Ttotal and RHVaisala must be corrected to account for these effects

Calculation of relative humidity by the Vaisala HMP243

P t o t a l = P w i n g ( m a n u f a c t u r e r ’ s c a l i b r a t i o n u s e d ; c o n f i r m e d b y A m e s l a b c a l i b )

jj

aj

5

0nose PP

static w h e r e a j a r e c o n s t a n t s d e r i v e d f r o m A m e s l a b & O a k s o n d e c a l i b r a t i o n

T t o t a l = T V a i s a l a p r o b e 2

kk 1

total

statictotastatic P

PTT

l w h e r e s p e c i f i c h e a t r a t i o , k =

v

pcc

= 1 . 4 f o r a i r

R H V a i s a l a = 1 0 0 *

totalTsat

mease

e

R H t r u e = R H V a i s a l a * staticT

totalT

sat

satee

q m e a s = staticT*R

H2O

mease

= staticT

T total* R* 100

H2O

sat *

VaisalaRH e

[ i d e a l g a s l a w ]

q c a l c [ g / m 3 ] = q ( R H t r u e , T s t a t i c , P s t a t i c ) [ B o e g e l , 1 9 7 7 ]

Calculation of water vapor density from J31 in-situ measurements

• Measured quantities: Pwing, Pnose, TVaisala probe2, RHVaisala

Ptotal(wing)

Pstatic(nose)

Calibration of J31 Pressure Sensors

Slide provided by Peter Pilewskie

P t o t a l = P w i n g ( m a n u f a c t u r e r ’ s c a l i b r a t i o n u s e d ; c o n f i r m e d b y A m e s l a b c a l i b )

jj

aj

5

0nose PP

static, w h e r e a j a r e c o n s t a n t s d e r i v e d f r o m A m e s l a b & O a k s o n d e c a l i b r a t i o n

T t o t a l = T V a i s a l a p r o b e 2

kk 1

total

statictotastatic P

PTT

l w h e r e s p e c i f i c h e a t r a t i o , k =

v

pcc

= 1 . 4 f o r a i r

R H V a i s a l a = 1 0 0 *

totalTsat

mease

e

R H t r u e = R H V a i s a l a * staticT

totalT

sat

satee

q m e a s = staticT*R

H2O

mease

= staticT

T total* R* 100

H2O

sat *

VaisalaRH e

[ i d e a l g a s l a w ]

q c a l c [ g / m 3 ] = q ( R H t r u e , T s t a t i c , P s t a t i c ) [ B o e g e l , 1 9 7 7 ]

Calculation of water vapor density from J31 in-situ measurements

• Measured quantities: Pwing, Pnose, TVaisala probe2, RHVaisala

Ron Brown Sonde meanDate J31 Flight direction altitude [km] UT [hr] UT [hh:mm:ss] separation [km] comments

12-Jul 7 ascent 0.2 - 4.6 18.6 - 18.85 17:05:24 107.520:43:24 105.1

15-Jul 8 ascent 2.3-5.6 15.8-16.02 15:32:51 4.0

16-Jul 9 descent 6.6-0.1 18.90-19.32 19:18:35 22.2ascent 0.1-3.2 19.32-19.43 19:18:35 26.0

17-Jul 10 ascent 0.1-4.9 14.25-14.5 16:56:22 131.9descent 4.9-0.3 14.5-14.725 11:00:06 47.3

16:56:22 91.9

20-Jul 11 descent 5.3-0.5 15.13-15.41 17:00:00 39.6ascent 0.7-4.5 15.87-16.06 17:00:00 41.3

21-Jul 12 ascent 0.5-5.3 17.16-17.4 17:00:00 60.9descent 5.6-0.2 17.65-17.93 17:00:00 102.6descent 5.6-0.2 18.86-19.11 17:00:00 82.4

22-Jul 13 descent 5.3-0.4 14.96-15.22 11:02:00 50.317:00:00 50.7

ascent 0.1-6.7 15.7-16.06 11:02:00 15.4 DC-8 coord17:00:00 3.6

23-Jul 14 descent 5.5-0.1 17.54-17.8 11:06:51 47.1ascent 0.2-2.75 18.18-18.3 11:06:51 23.6

26-Jul 15 ascent 0-5.9 19.21-19.52 ozonesonde?descent 5.6-0.3 19.64-19.82ascent 0.2-6.4 20.05-20.4

29-Jul 16 descent 6.4-0.1 14.85-15.23 15:22:46 7.216 ascent 0.2-7.3 16.4-16.85 17:33:47 62.2

31-Jul 18 descent 6.6-0.2 17.17-17.47 17:00:19 14.9 DC-3 coord

2-Aug 19 descent 4.5-0.3 14.96-15.21 17:02:57 123.1ascent 0.2-3.9 15.87-16.03 17:02:57 137.0

descent 4.0-0.1 16.30-16.52 17:02:57 84.2

2-Aug 20 descent 6.6-0.1 20.94-21.25 17:02:57 103.9ascent 0.1-6.7 21.59-22.00 17:02:57 22.5 DC-8 coord

3-Aug 21 ascent 0.2-7.0 21.15-21.55 21:35:37 15.9

7-Aug 22 ascent 0.1-7.1 15.34-15.77 ozonesonde DC-8/MISR

7-Aug 23 descent 5.9-0.2 20.12-20.32 20:13:00 39.9ascent 0.2-5.9 20.32-20.61 20:13:00 42.9

8-Aug 24 descent 3.4-0.1 17.35-17.52 17:01:22 62.7ascent 0.2-3.4 17.97-18.17 17:01:22 222.6

descent 3.4-0.2 18.27-18.47 17:01:22 150.9

AATS-14

Table of AATS-14 H2O

profiles and Ron Brown radiosonde measurements

16 Jul F9

uncorrected

15 Jul F8

22 Jul F13

• DC-8 coordination

29 Jul F16

31 Jul F18

2 Aug F20

• DC-8 coordination

3 Aug F21

• DC-8 coordination

7 Aug F22

• DC-8 coordination, MISR

missing sonde?

7 Aug F23