Cirrus Clouds near the mid-latitude tropopause

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Presentation transcript:

Cirrus Clouds near the mid-latitude tropopause from CALIPSO Steven T Massie ACD/NCAR January 8, 2008

Outline How likely is it to observe cirrus between double tropopauses? Data: Lidar observations over France FNL (NCEP) analyses of multiple tropopauses CALIPSO observations over North America

April – May double tropopauses occur ~ 25 % of the time (Paris) 30% 25 20 May Noel and Haeffeln, Midlatitude cirrus clouds and multiple tropopauses from a 2002 – 2006 climatology over the SIRTA observatory, JGR, 112, D13206, doe:10.1029/2006JD007753, 2007.

Lidar observations for a single day Double tropopause layers are ~ 1.5 km thick Altitude (km) Time  15 14 13 12 11 10 9 8 7 6 Noel and Haeffeln, Midlatitude cirrus clouds and multiple tropopauses from a 2002 – 2006 climatology over the SIRTA observatory, JGR, 112, D13206, doe:10.1029/2006JD007753, 2007.

Most cirrus cloud tops are below the tropopause Z (cloud top) – Z (tropopause) Noel and Haeffeln, Midlatitude cirrus clouds and multiple tropopauses from a 2002 – 2006 climatology over the SIRTA observatory, JGR, 112, D13206, doe:10.1029/2006JD007753, 2007.

Statistical Summary of SIRTA Clouds Frequency of Cirrus case occurrence 83% Cloud top > 0.5 km below the tropopuase 10% Cloud top < 0.5 km below the tropopuase 5% Cirrus is at or above the tropopause 2% Cirrus is between a double tropopause % values are for instances when clouds are observed Noel and Haeffeln, Midlatitude cirrus clouds and multiple tropopauses from a 2002 – 2006 climatology over the SIRTA observatory, JGR, 112, D13206, doe:10.1029/2006JD007753, 2007.

2nd trop heights are mostly at 16 - 17 km altitudes 2nd Tropopuase Heights from FNL Analyses 2nd trop heights are mostly at 16 - 17 km altitudes Some are between 13-14 km

Calipso Example: May 28 Altitude (km) 30 20 10 56 50 45 38 32 N lat 9:20 – 9:35 UTC

Calipso Example: May 25 T = tropopause height from FNL analyses

CALIPSO and FNL Analyses in 2007 Month % multiple % of time clouds are tropopauses between multiple tropopause April 16% 2% May 10% 1%

Summary Based upon lidar observations over France CALIPSO/ FNL (NCEP) data clouds are between double tropopauses ~ 2% of the time If you know that a double tropopause will occur, then you have a roughly 1 in 10 chance of observing cirrus above the 1st (lowest) tropopause.