研究目的
Investigating the nightly mean emission height and width of the OH?(3–1) layer by comparing temperatures measured by GRIPS9 and the Nalidar at ALOMAR.
研究成果
The nightly OH? layer height generally cannot be determined unambiguously from temperature measurements by lidars, regardless of whether a variable layer width is taken into account. The OH?(3–1) rotational temperature as a proxy for the temperature at 87 km with a width of 8.4 km is representative within ±16 K for any given day of this analysis.
研究不足
The ambiguity in determining the OH? layer altitude and width from lidar measurements alone, due to multiple combinations of centre altitude and width yielding similar temperature differences. The assumption of a Gaussian-shaped OH? layer is a simplification.
1：Experimental Design and Method Selection:
The study compares nightly mean temperatures measured by the ground–based spectrometer GRIPS9 and the Nalidar at ALOMAR. Gaussian distributions with 40 different centre altitudes and 40 different full widths at half maximum were used to weight the lidar temperature profiles to resemble those measured by GRIPS
2：Sample Selection and Data Sources:
The dataset contains 42 coincident measurements between November 2010 and February 2014 at the ALOMAR observatory (69.3?N, 16.0?E) in northern Norway.
3：3?N, 0?E) in northern Norway.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: GRIPS9 spectrometer and Nalidar at ALOMAR.
4：Experimental Procedures and Operational Workflow:
Nightly mean temperatures were computed from GRIPS9 measurements at one–minute intervals. Lidar data were weighted with Gaussian functions to approximate OH? layer temperatures.
5：Data Analysis Methods:
The temperature difference between GRIPS9 and the weighted lidar temperatures was calculated to find the minimum difference, indicating the best agreement for the OH? layer altitude and width.
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