D Q R Report

DQRID : D140515.3

Start Date	Start Time	End Date	End Time	Data Quality Metric
06/15/2011	0000	04/09/2012	0000	Does not affect quality

Subject:	GAN/PBLHT/M1-Oceanic Site Planetary Boundary Layer Heights (PBLHs) from Radiosondes - Possible Issue
DataStreams:	ganpblhtsonde1mcfarlM1.c1, ganpblhtsondeyr1mcfarlM1.c1, ganpblhtsonde1mcfarlM1.s1, ganpblhtsondeyr1mcfarlM1.s1
Description:	Automated methods for estimating PBLHs from radiosonde data may in some instances be identifying shallow stable layers over island surfaces as the PBLH. Insufficient data exists at this time to modify the automated algorithms to resolve this situation. Reported oceanic site PBLHs of <100 m, particularly at night, should be used with caution.
Suggestions:	When reported VAP PBLHs are <100 m, users should manually compare radiosonde potential temperature vs. height diagrams with the four VAP estimates to determine if shallow stable layers exist.
Measurements:	ganpblhtsonde1mcfarlM1.s1: pbl_height_liu_liang pbl_height_bulk_richardson_pt5 pbl_height_bulk_richardson_pt25 pbl_height_heffter more ganpblhtsonde1mcfarlM1.c1: pbl_height_heffter pbl_height_liu_liang pbl_height_bulk_richardson_pt25 pbl_height_bulk_richardson_pt5 more ganpblhtsondeyr1mcfarlM1.s1: pbl_height_bulk_richardson_pt5 pbl_height_bulk_richardson_pt25 pbl_height_liu_liang pbl_regime_type_liu_liang pbl_height_heffter more ganpblhtsondeyr1mcfarlM1.c1: pbl_height_heffter pbl_height_bulk_richardson_pt5 pbl_height_liu_liang pbl_height_bulk_richardson_pt25 more