DNB cloud mask test with CALIPSO over the W. coast area of S. America

• Cases: 20140812, 20140908, 20141108, 20141015• CLAVR-x generated Cloud Mask with VIIRS DNB on & off• NLCOMP & ACHA (11/12 microns) comparisons• CALIPSO Level2 1-km Cloud Layer (Layer Top & Base) and 5-km VFM

(Vertical Feature Mask-Cloud) data• CALIPSO cloud profiles with median and high confidence flags only

S. Miller and Y. Noh at CIRA/CSU (23 March 2015)

DNB and M15 (10.76 microns)VIIRS 0600-0621 UTC on 12 Aug 2014

COT (NLCOMP and ACHA) VIIRS 0600-0621 UTC on 12 Aug 2014

EPS (NLCOMP and ACHA) VIIRS 0600-0621 UTC on 12 Aug 2014

Cloud Mask (DNB on and off)VIIRS 0600-0621 UTC on 12 Aug 2014 (Red line: CALIPSO)

Cloud Mask Changes 12 Aug 2014(16 granules)

Each color represents cloud mask with IR only and the distributions along the x-axis show how the cloud mask changes with DNB (lunar refl on). Many ‘Probably clear’ and ‘Probably cloudy’ pixels from IR only are classified as ‘Cloudy’ with DNB on.

CALIPSO-VIIRS cloud mask12 Aug 2014

CALIPSO cloudy profiles (CL01)

VIIRS cloudy pixels (DNB on)

VIIRS cloudy pixels (DNB off)

5681 4755 4798

CALIPSO cloudy profiles (VFM)

VIIRS cloudy pixels (DNB on)

VIIRS cloudy pixels (DNB off)

1246 965 980

• VIIRS granules: 060157-062317 UTC• CALIOP profiles: 060943-062949

UTC• Upper: Layer top & base altitudes

from CALIPSO 1-km Cloud Layer product (cyan) and each closest VIIRS pixel’s Cloud Mask from clavr-x (red: DNB on, blue: DNB off-ACHA1)

• Bottom: Cloud typed from CALIPSO 5-km Vertical Feature Mask product

12 Aug 2014

DNB and M15 (10.76 microns)VIIRS 0554-0618 UTC on 08 Sep 2014

COT (NLCOMP and ACHA) VIIRS 0554-0618 UTC on 08 Sep 2014

EPS (NLCOMP and ACHA) VIIRS 0554-0618 UTC on 08 Sep 2014

Cloud Mask (DNB on and off)VIIRS 0554-0618 UTC on 08 Sep 2014 (Red line: CALIPSO)

Cloud Mask Changes 08 Sep 2014(17 granules)

Each color represents cloud mask with IR only and the distributions along the x-axis show how the cloud mask changes with DNB (lunar refl on). Many ‘Probably clear’ and ‘Probably cloudy’ pixels from IR only are classified as ‘Cloudy’ with DNB on.

CALIPSO-VIIRS cloud mask08 Sep 2014

CALIPSO cloudy profiles (CL01)

VIIRS cloudy pixels (DNB on)

VIIRS cloudy pixels (DNB off)

6051 5166 5223

CALIPSO cloudy profiles (VFM)

VIIRS cloudy pixels (DNB on)

VIIRS cloudy pixels (DNB off)

1356 1081 1088

• VIIRS granules: 055602-061847 UTC• CALIOP profiles: 055049-061141

UTC• Upper: Layer top & base altitudes

from CALIPSO 1-km Cloud Layer product (cyan) and each closest VIIRS pixel’s Cloud Mask from clavr-x (red: DNB on, blue: DNB off-ACHA1)

• Bottom: Cloud typed from CALIPSO 5-km Vertical Feature Mask product

08 Sep 2014

DNB and M15 (10.76 microns)VIIRS 0653-0715 UTC on 08 Nov 2014

COT (NLCOMP and ACHA) VIIRS 0653-0715 UTC on 08 Nov 2014

EPS (NLCOMP and ACHA) VIIRS 0653-0715 UTC on 08 Nov 2014

Cloud Mask (DNB on and off)VIIRS 0653-0715 UTC on 08 Nov 2014 (Red line: CALIPSO)

Cloud Mask Changes 08 Nov 2014(13 granules)

Each color represents cloud mask with IR only and the distributions along the x-axis show how the cloud mask changes with DNB (lunar refl on). Many ‘Probably clear’ and ‘Probably cloudy’ pixels from IR only are classified as ‘Cloudy’ with DNB on.

CALIPSO-VIIRS cloud mask08 Nov 2014

CALIPSO cloudy profiles (CL01)

VIIRS cloudy pixels (DNB on)

VIIRS cloudy pixels (DNB off)

6304 5575 5104

CALIPSO cloudy profiles (VFM)

VIIRS cloudy pixels (DNB on)

VIIRS cloudy pixels (DNB off)

1306 1127 1033

• VIIRS granules: 065344-071213 UTC• CALIOP profiles: 065901-071626

UTC• Upper: Layer top & base altitudes

from CALIPSO 1-km Cloud Layer product (cyan) and each closest VIIRS pixel’s Cloud Mask from clavr-x (red: DNB on, blue: DNB off-ACHA1)

• Bottom: Cloud typed from CALIPSO 5-km Vertical Feature Mask product

08 Nov 2014

DNB and M15 (10.76 microns)VIIRS 0604-0617 UTC on 15 Oct 2014 (3rd quarter moon phase)

COT (NLCOMP and ACHA) VIIRS 0604-0617 UTC on 15 Oct 2014

3rd quarter moon phase partially with lunar zeniths over the threshold

EPS (NLCOMP and ACHA) VIIRS 0604-0628 UTC on 15 Oct 2014

3rd quarter moon phase partially with lunar zeniths over the threshold

Cloud Mask (DNB on and off)VIIRS 0604-0617 UTC on 15 Oct 2014 (Red line: CALIPSO)

Cloud Mask Changes 15 Oct 2014(9 granules)

Each color represents cloud mask with IR only and the distributions along the x-axis show how the cloud mask changes with DNB (lunar refl on). Many ‘Probably clear’ and ‘Probably cloudy’ pixels from IR only are classified as ‘Cloudy’ with DNB on.

CALIPSO-VIIRS cloud mask15 Oct 2014 (3rd quarter moon phase)

CALIPSO cloudy profiles (CL01)

VIIRS cloudy pixels (DNB on)

VIIRS cloudy pixels (DNB off)

4078 3558 3651

CALIPSO cloudy profiles (VFM)

VIIRS cloudy pixels (DNB on)

VIIRS cloudy pixels (DNB off)

858 717 731

• VIIRS granules: 060419-061706 UTC• CALIOP profiles: 060940-062209

UTC• Upper: Layer top & base altitudes

from CALIPSO 1-km Cloud Layer product (cyan) and each closest VIIRS pixel’s Cloud Mask from clavr-x (red: DNB on, blue: DNB off-ACHA1)

• Bottom: Cloud typed from CALIPSO 5-km Vertical Feature Mask product

No lunar refl impact between -38 ~ -60 S

15 Oct 20143rd quarter moon phase partially with lunar zeniths over the threshold