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-14 SSFR

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, T total, and relative humidity, RH Vaisala, were recorded by SSFR data system Because the separate temperature probe is subject to dynamic heating effects, both T total and RH Vaisala must be corrected to account for these effects Calculation of relative humidity by the Vaisala HMP243

Calculation of water vapor density from J31 in-situ measurements Measured quantities: P wing, P nose, T Vaisala probe2, RH Vaisala

P total (wing) P static (nose) Calibration of J31 Pressure Sensors Slide provided by Peter Pilewskie

Calculation of water vapor density from J31 in-situ measurements Measured quantities: P wing, P nose, T Vaisala probe2, RH Vaisala

Table of AATS-14 H 2 O 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