Extinction Coefficients retrieved in Deep Tropical Ice Clouds from Lidar Observations using a CALIPSO-like Algorithm compared to In-Situ Measurements from the Cloud Integrating Nephelometer during CRYSTAL-FACE Export

@article{NOEL:2007:HALSDE-00136133:1, abstract = {{T}his paper presents a comparison of lidar ratios and volume extinction coefficients in tropical ice clouds, retrieved using observations from two instruments: the 532-nm {C}loud {P}hysics {L}idar ({CPL}), and the in-situ {C}loud {I}ntegrating {N}ephelometer ({CIN}) probe. {B}oth instruments were mounted on airborne platforms during the {CRYSTAL}-{FACE} campaign and took measurements up to 17 km. {C}oincident observations from two cases of ice clouds located on top of deep convective systems are compared. {F}irst, lidar ratios are retrieved from {CPL} observations of attenuated backscatter, using a retrieval algorithm for opaque cloud similar to one used in the recently launched {CALIPSO} mission, and compared to results from the regular {CPL} algorithm. {T}hese lidar ratios are used to retrieve extinction coefficient profiles, which are compared to actual observations from the {CIN} in-situ probe, putting the emphasis on their vertical variability. {W}hen observations coincide, retrievals from both instruments are very similar, in the limits of colocation. {D}ifferences are generally variations around the average profiles, and general trends on larger spatial scales are well reproduced. {T}he two instruments agree well, with an average difference of less than 11 on optical depth retrievals. {R}esults suggest the {CALIPSO} {D}eep {C}onvection algorithm can be trusted to deliver realistic estimates of the lidar ratio, leading to good retrievals of extinction coefficients.}, author = {{n}oel, {v}incent and {w}inker, {d}avid and {g}arrett, {t}im and {m}cgill, {m}atthew}, citeulike-article-id = {4828453}, citeulike-linkout-0 = {http://hal-sde.archives-ouvertes.fr/halsde-00136133/en/}, journal = {{A}tmospheric {C}hemistry and {P}hysics}, keywords = {calipso, crystal-face, extinction, nephelometer}, pages = {1--8}, posted-at = {2009-06-12 18:30:56}, priority = {2}, title = {{E}xtinction {C}oefficients retrieved in {D}eep {T}ropical {I}ce {C}louds from {L}idar {O}bservations using a {CALIPSO}-like {A}lgorithm compared to {I}n-{S}itu {M}easurements from the {C}loud {I}ntegrating {N}ephelometer during {CRYSTAL}-{FACE}}, url = {http://hal-sde.archives-ouvertes.fr/halsde-00136133/en/}, volume = {7}, year = {2007} }

TY - JOUR ID - NOEL:2007:HALSDE-00136133:1 L3 - citeulike-article-id:4828453 N2 - {T}his paper presents a comparison of lidar ratios and volume extinction coefficients in tropical ice clouds, retrieved using observations from two instruments: the 532-nm {C}loud {P}hysics {L}idar ({CPL}), and the in-situ {C}loud {I}ntegrating {N}ephelometer ({CIN}) probe. {B}oth instruments were mounted on airborne platforms during the {CRYSTAL}-{FACE} campaign and took measurements up to 17 km. {C}oincident observations from two cases of ice clouds located on top of deep convective systems are compared. {F}irst, lidar ratios are retrieved from {CPL} observations of attenuated backscatter, using a retrieval algorithm for opaque cloud similar to one used in the recently launched {CALIPSO} mission, and compared to results from the regular {CPL} algorithm. {T}hese lidar ratios are used to retrieve extinction coefficient profiles, which are compared to actual observations from the {CIN} in-situ probe, putting the emphasis on their vertical variability. {W}hen observations coincide, retrievals from both instruments are very similar, in the limits of colocation. {D}ifferences are generally variations around the average profiles, and general trends on larger spatial scales are well reproduced. {T}he two instruments agree well, with an average difference of less than 11 on optical depth retrievals. {R}esults suggest the {CALIPSO} {D}eep {C}onvection algorithm can be trusted to deliver realistic estimates of the lidar ratio, leading to good retrievals of extinction coefficients. JF - {A}tmospheric {C}hemistry and {P}hysics EP - 8 TI - {E}xtinction {C}oefficients retrieved in {D}eep {T}ropical {I}ce {C}louds from {L}idar {O}bservations using a {CALIPSO}-like {A}lgorithm compared to {I}n-{S}itu {M}easurements from the {C}loud {I}ntegrating {N}ephelometer during {CRYSTAL}-{FACE} VL - 7 SP - 1 KW - calipso KW - crystal-face KW - extinction KW - nephelometer AU - {n}oel, {v}incent AU - {w}inker, {d}avid AU - {g}arrett, {t}im AU - {m}cgill, {m}atthew PY - 2007/// UR - http://hal-sde.archives-ouvertes.fr/halsde-00136133/en/ ER -