The land below the wind: Doppler LiDAR observations from the tropical rain forest of Sabah, Borneo, Malaysia

Collier, C. G.; Davies, F.; Pearson, Guy N.

doi:10.1002/wea.429

Cited by 4 publications

(3 citation statements)

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“…and steep-sided valleys with valley floors at about 200 m a.s.l. [56,57] (figure 2). The ground-based oil palm plantation measurements were obtained in a flat 33 ha section of the much larger Sabahmas oil palm plantation, situated on the low-lying plain to the north and east of Danum Valley.…”

Section: The Op3/aces Campaignmentioning

confidence: 99%

“…In the afternoon, convection is often strong enough to produce thunderstorms, giving an afternoon peak in rainfall [54,62]. During OP3, boundary-layer characteristics were monitored using in situ instruments on the GAW tower [63] and remotely using Doppler lidar [56,57]. At the oil palm plantation, eddy covariance measurements at the top of the canopy provide boundarylayer characterization [2].…”

Section: Boundary Layer Characteristicsmentioning

confidence: 99%

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The atmospheric chemistry of trace gases and particulate matter emitted by different land uses in Borneo

MacKenzie

Langford

Pugh

et al. 2011

Phil. Trans. R. Soc. B

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We report measurements of atmospheric composition over a tropical rainforest and over a nearby oil palm plantation in Sabah, Borneo. The primary vegetation in each of the two landscapes emits very different amounts and kinds of volatile organic compounds (VOCs), resulting in distinctive VOC fingerprints in the atmospheric boundary layer for both landscapes. VOCs over the Borneo rainforest are dominated by isoprene and its oxidation products, with a significant additional contribution from monoterpenes. Rather than consuming the main atmospheric oxidant, OH, these high concentrations of VOCs appear to maintain OH, as has been observed previously over Amazonia. The boundary-layer characteristics and mixing ratios of VOCs observed over the Borneo rainforest are different to those measured previously over Amazonia. Compared with the Bornean rainforest, air over the oil palm plantation contains much more isoprene, monoterpenes are relatively less important, and the flower scent, estragole, is prominent. Concentrations of nitrogen oxides are greater above the agroindustrial oil palm landscape than over the rainforest, and this leads to changes in some secondary pollutant mixing ratios (but not, currently, differences in ozone). Secondary organic aerosol over both landscapes shows a significant contribution from isoprene. Primary biological aerosol dominates the super-micrometre aerosol over the rainforest and is likely to be sensitive to land-use change, since the fungal source of the bioaerosol is closely linked to above-ground biodiversity.

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Section: The Op3/aces Campaignmentioning

confidence: 99%

Section: Boundary Layer Characteristicsmentioning

confidence: 99%

The atmospheric chemistry of trace gases and particulate matter emitted by different land uses in Borneo

MacKenzie

Langford

Pugh

et al. 2011

Phil. Trans. R. Soc. B

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“…The ABL is also influenced by local topography (e.g. Barlow and Coceal, 2009;Collier et al, 2010). The urban environment is typically composed of roughness elements (buildings and trees) with different heights creating temporally and spatially varying wind and turbulent fields (Wood et al, 2009a); waves and trees induce a similar effect above the ocean and forest, respectively.…”

Section: Introductionmentioning

confidence: 99%

Observing wind, aerosol particles, cloud and precipitation: Finland's new ground-based remote-sensing network

et al. 2014

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Abstract. The Finnish Meteorological Institute, in collaboration with the University of Helsinki, has established a new ground-based remote-sensing network in Finland. The network consists of five topographically, ecologically and climatically different sites distributed from southern to northern Finland. The main goal of the network is to monitor air pollution and boundary layer properties in near real time, with a Doppler lidar and ceilometer at each site. In addition to these operational tasks, two sites are members of the Aerosols, Clouds and Trace gases Research InfraStructure Network (ACTRIS); a Ka band cloud radar at Sodankylä will provide cloud retrievals within CloudNet, and a multi-wavelength Raman lidar, PollyXT (POrtabLe Lidar sYstem eXTended), in Kuopio provides optical and microphysical aerosol properties through EARLINET (the European Aerosol Research Lidar Network). Three C-band weather radars are located in the Helsinki metropolitan area and are deployed for operational and research applications. We performed two inter-comparison campaigns to investigate the Doppler lidar performance, compare the backscatter signal and wind profiles, and to optimize the lidar sensitivity through adjusting the telescope focus length and data-integration time to ensure sufficient signal-to-noise ratio (SNR) in low-aerosol-content environments. In terms of statistical characterization, the wind-profile comparison showed good agreement between different lidars. Initially, there was a discrepancy in the SNR and attenuated backscatter coefficient profiles which arose from an incorrectly reported telescope focus setting from one instrument, together with the need to calibrate. After diagnosing the true telescope focus length, calculating a new attenuated backscatter coefficient profile with the new telescope function and taking into account calibration, the resulting attenuated backscatter profiles all showed good agreement with each other. It was thought that harsh Finnish winters could pose problems, but, due to the built-in heating systems, low ambient temperatures had no, or only a minor, impact on the lidar operation – including scanning-head motion. However, accumulation of snow and ice on the lens has been observed, which can lead to the formation of a water/ice layer thus attenuating the signal inconsistently. Thus, care must be taken to ensure continuous snow removal.

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Painting the weather in the Tropics

Conway¹

2010

Weather

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The land below the wind: Doppler LiDAR observations from the tropical rain forest of Sabah, Borneo, Malaysia

Cited by 4 publications

References 11 publications

The atmospheric chemistry of trace gases and particulate matter emitted by different land uses in Borneo

The atmospheric chemistry of trace gases and particulate matter emitted by different land uses in Borneo

Observing wind, aerosol particles, cloud and precipitation: Finland's new ground-based remote-sensing network

Painting the weather in the Tropics

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