Assessment of the CALIPSO Lidar 532 nm attenuated backscatter calibration using the NASA LaRC airborne High Spectral Resolution Lidar

Rogers, Raymond R.; Hostetler, C. A.; Hair, Johnathan W.; Ferrare, R. A.; Liu, Zhaoyan; Obland, M. D.; Harper, David B.; Cook, Anthony; Powell, Kathleen A.; Vaughan, Mark; Winker, David M.

doi:10.5194/acp-11-1295-2011

Cited by 114 publications

(91 citation statements)

References 34 publications

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“…CALIOP's attenuated backscatter shows a very small negative bias relative to AHSRL both at nighttime (−2.7 % ± 2.1 %) and daytime (−2.9 % ± 3.9 %) but lies within the uncertainties of AHSRL (Rogers et al, 2011). No seasonal, latitudinal or vertical dependencies were found.…”

Section: Space-borne Caliop Lidarmentioning

confidence: 83%

“…Daytime retrievals are less accurate than nighttime retrievals because they are affected by the noise from scattering of solar radiation in the field of view of the detector Rogers et al, 2011). Daytime retrievals thus have a higher backscatter sensitivity threshold (∼0.5 Mm −1 sr −1 at sea level) compared to nighttime retrievals (∼0.4 Mm −1 sr −1 ).…”

Section: Space-borne Caliop Lidarmentioning

confidence: 99%

“…The CALIOP 532 nm version 3.01 calibration has been validated against aircraft measurements by the NASA Langley airborne high spectral resolution lidar (AHSRL) instrument for a wide seasonal and latitude range covering diverse aerosol and cloud conditions (Rogers et al, 2011). CALIOP's attenuated backscatter shows a very small negative bias relative to AHSRL both at nighttime (−2.7 % ± 2.1 %) and daytime (−2.9 % ± 3.9 %) but lies within the uncertainties of AHSRL (Rogers et al, 2011).…”

Section: Space-borne Caliop Lidarmentioning

confidence: 99%

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Spatial and seasonal distribution of Arctic aerosols observed by the CALIOP satellite instrument (2006–2012)

et al. 2013

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We use retrievals of aerosol extinction from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) onboard the CALIPSO satellite to examine the vertical, horizontal and temporal variability of tropospheric Arctic aerosols during the period 2006–2012. We develop an empirical method that takes into account the difference in sensitivity between daytime and nighttime retrievals over the Arctic. Comparisons of the retrieved aerosol extinction to in situ measurements at Barrow (Alaska) and Alert (Canada) show that CALIOP reproduces the observed seasonal cycle and magnitude of surface aerosols to within 25 %. In the free troposphere, we find that daytime CALIOP retrievals will only detect the strongest aerosol haze events, as demonstrated by a comparison to aircraft measurements obtained during NASA's ARCTAS mission during April 2008. This leads to a systematic underestimate of the column aerosol optical depth by a factor of 2–10. However, when the CALIOP sensitivity threshold is applied to aircraft observations, we find that CALIOP reproduces in situ observations to within 20% and captures the vertical profile of extinction over the Alaskan Arctic. Comparisons with the ground-based high spectral resolution lidar (HSRL) at Eureka, Canada, show that CALIOP and HSRL capture the evolution of the aerosol backscatter vertical distribution from winter to spring, but a quantitative comparison is inconclusive as the retrieved HSRL backscatter appears to overestimate in situ observations by a factor of 2 at all altitudes. In the High Arctic (>70° N) near the surface (<2 km), CALIOP aerosol extinctions reach a maximum in December–March (10–20 Mm⁻¹), followed by a sharp decline and a minimum in May–September (1–4 Mm⁻¹), thus providing the first pan-Arctic view of Arctic haze seasonality. The European and Asian Arctic sectors display the highest wintertime extinctions, while the Atlantic sector is the cleanest. Over the Low Arctic (60–70° N) near the surface, CALIOP extinctions reach a maximum over land in summer due to boreal forest fires. During summer, we find that smoke aerosols reach higher altitudes (up to 4 km) over eastern Siberia and North America than over northern Eurasia, where they remain mostly confined below 2 km. In the free troposphere, the extinction maximum over the Arctic occurs in March–April at 2–5 km altitude and April–May at 5–8 km. This is consistent with transport from the midlatitudes associated with the annual maximum in cyclonic activity and blocking patterns in the Northern Hemisphere. A strong gradient in aerosol extinction is observed between 60° N and 70° N in the summer. This is likely due to efficient stratocumulus wet scavenging at high latitudes combined with the poleward retreat of the polar front. Interannual variability in the middle and upper troposphere is associated with biomass burning events (high extinctions observed by CALIOP in spring 2008 and summer 2010) and volcanic eruptions (Kasatochi in August 2008 and Sarychev in June 2009). CALIOP displays below-a...

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Section: Space-borne Caliop Lidarmentioning

confidence: 83%

Section: Space-borne Caliop Lidarmentioning

confidence: 99%

Section: Space-borne Caliop Lidarmentioning

confidence: 99%

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Spatial and seasonal distribution of Arctic aerosols observed by the CALIOP satellite instrument (2006–2012)

et al. 2013

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“…Through extensive comparisons between CALIOP and the airborne NASA Langley Research Center High Spectral Resolution Lidar, Rogers et al (2011) have demonstrated the high accuracy of CALIOP's 532 nm attenuated backscatter calibration, finding that total attenuated backscatter from the two instruments agrees within 2.7 % ± 2.1 % at night and 2.9 % ± 3.9 % during the day. Other studies have also found good agreement between CALIOP and ground-based lidar measurements (e.g., Mamouri et al, 2009;Mona et al, 2009).…”

Section: Satellite Observationsmentioning

confidence: 99%

Aerosol loading in the Southeastern United States: reconciling surface and satellite observations

Ford

Heald

2013

Atmos. Chem. Phys.

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We investigate the seasonality in aerosols over the Southeastern United States using observations from several satellite instruments (MODIS, MISR, CALIOP) and surface network sites (IMPROVE, SEARCH, AERONET). We find that the strong summertime enhancement in satellite-observed aerosol optical depth (AOD) (factor 2–3 enhancement over wintertime AOD) is not present in surface mass concentrations (25–55% summertime enhancement). Goldstein et al. (2009) previously attributed this seasonality in AOD to biogenic organic aerosol; however, surface observations show that organic aerosol only accounts for ∼35% of fine particulate matter (smaller than 2.5 μm in aerodynamic diameter, PM_2.5) and exhibits similar seasonality to total surface PM_2.5. The GEOS-Chem model generally reproduces these surface aerosol measurements, but underrepresents the AOD seasonality observed by satellites. We show that seasonal differences in water uptake cannot sufficiently explain the magnitude of AOD increase. As CALIOP profiles indicate the presence of additional aerosol in the lower troposphere (below 700 hPa), which cannot be explained by vertical mixing, we conclude that the discrepancy is due to a missing source of aerosols above the surface layer in summer

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“…However, the stratospheric backscatter signal is weak and requires averaging of only the nighttime measurements over several days and typically 0.5 km vertically and 500 km horizontally (Vernier et al, 2011b). Additionally, the uncertainty in the calibration with respect to the molecular background that is on the order of the stratospheric aerosol signal leads to a potential bias in the stratospheric measurements (Rogers et al, 2011). CALIPSO was launched in 2006, and although it is presently still operational it is also operating beyond its design lifetime.…”

Section: Introductionmentioning

confidence: 99%

The Aerosol Limb Imager: acousto-optic imaging of limb-scattered sunlight for stratospheric aerosol profiling

et al. 2016

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Abstract. The Aerosol Limb Imager (ALI) is an optical remote sensing instrument designed to image scattered sunlight from the atmospheric limb. These measurements are used to retrieve spatially resolved information of the stratospheric aerosol distribution, including spectral extinction coefficient and particle size. Here we present the design, development and test results of an ALI prototype instrument. The longterm goal of this work is the eventual realization of ALI on a satellite platform in low earth orbit, where it can provide high spatial resolution observations, both in the vertical and cross-track. The instrument design uses a large-aperture acousto-optic tunable filter (AOTF) to image the sunlit stratospheric limb in a selectable narrow wavelength band ranging from the visible to the near infrared. The ALI prototype was tested on a stratospheric balloon flight from the Canadian Space Agency (CSA) launch facility in Timmins, Canada, in September 2014. Preliminary analysis of the hyperspectral images indicates that the radiance measurements are of high quality, and we have used these to retrieve vertical profiles of stratospheric aerosol extinction coefficient from 650 to 1000 nm, along with one moment of the particle size distribution. Those preliminary results are promising and development of a satellite prototype of ALI within the Canadian Space Agency is ongoing.

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Assessment of the CALIPSO Lidar 532 nm attenuated backscatter calibration using the NASA LaRC airborne High Spectral Resolution Lidar

Cited by 114 publications

References 34 publications

Spatial and seasonal distribution of Arctic aerosols observed by the CALIOP satellite instrument (2006–2012)

Spatial and seasonal distribution of Arctic aerosols observed by the CALIOP satellite instrument (2006–2012)

Aerosol loading in the Southeastern United States: reconciling surface and satellite observations

The Aerosol Limb Imager: acousto-optic imaging of limb-scattered sunlight for stratospheric aerosol profiling

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