Rawinsonde Kite Profiles

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Presentation transcript:

Rawinsonde Kite Profiles LT Dave Kuehn 18 Sep 2002

Comparing Kite Profiles to Bulk Method (Fairall 1996) Why Evap duct Operational significance How Brief overview on methods Matlab program What Results Kite data vs. Bulk Method

Ducting Height (m) M 300 200 100 Elevated Duct Surface-based Duct Surface-based Duct Height (m) Evaporation Duct M

Evaporation Duct 15 10 5 Z* Height (m) Evap Duct M 80 90 100 RH (%)

Propagation Loss for Radar Within Evaporation Duct Duct Ht = 65 ft, radar @ 55 ft Greatly Increased Detection Ranges Possible Duct

Method and Manipulation Program assumes height based on press Negative heights not possible Modify based on in-situ height and time recordings (purple line)

Method and Manipulation Select bad data (purple) Ship influence Readings prior to launch Kite dipping Green is ship data Difference in press and RH

Method and Manipulation Select interval average based on similar airmass characteristics Pot Temp and RH and M profile data (red marks)

Average over selected interval Select average air temp, sea temp and RH Fairall’s Bulk Method derived Pot Temp, RH and M profile (black line) Mean kite data over interval (lavender circles)

Results 17 July 2002 1400 - 1415

Results 17 July 2002 1500 - 1520

Results 19 July 2002 1945 - 1955 Evap duct present later in afternoon on 19 July. Coincides closely with Rh gradient. Evap first noted at 1910 on 19 July

Results 19 July 1845 - 2010 Evap No duct duct Evap Evap Duct duct One average period fits bulk method better than smaller periods Evap Duct ~1910 Evap duct

Conclusions: Subjective Error Surface height, kite height, sonde response, contaminated averages, air temp vs sea temp Bulk Method did not represent atmosphere well, high atmospheric variability (esp RH) Bulk Method always shows duct height 6-9 meters. Kite did not. When duct was measured (starting 1910 on 19 July) Bulk Method generally showed a lower duct height (7 meters) than kite data (11+ meters) Evap ducts of <1-2m extremely difficult to detect