北极碳循环探究:2012-2015年空中飞行光谱数据分析

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【摘要】 CARVE: L1 Spectral Radiances from Airborne FTS, Alaska, 2012-2015简介该数据集包含一级光谱辐射数据,这些数据是在北极水库碳脆弱性实验(CARVE)的阿拉斯加和加拿大北极地区空中飞行期间使用傅里叶变换光谱仪 (FTS) 收集的。飞行飞行于 2012 年至 2015 年 3 月至 11 月期间进行,旨在研究大气气体含量的季节和年际变...

CARVE: L1 Spectral Radiances from Airborne FTS, Alaska, 2012-2015

简介

该数据集包含一级光谱辐射数据,这些数据是在北极水库碳脆弱性实验(CARVE)的阿拉斯加和加拿大北极地区空中飞行期间使用傅里叶变换光谱仪 (FTS) 收集的。飞行飞行于 2012 年至 2015 年 3 月至 11 月期间进行,旨在研究大气气体含量的季节和年际变化。该数据集中包含的测量数据对于理解北极碳循环的变化以及北极永久冻土融化带来的潜在威胁至关重要。

摘要

Table 1. CARVE file naming convention. Example file name: carve_FTS_L1_b23_20120511_160419_20150915171127.nc

Name element Example value Units
Project name carve
Instrument FTS
Processing level L1
Build ID b23
Flight date 20120511 yyyymmdd
Acquisition time 160419 hhmmss
Processing date and time 20150915171127 yyyymmddhhmmss

Data variables

Each file contains four variable groups: aviation_housekeepinggeolocationmeasurement_ancillary_info, and science_measurement. The variables contained within each variable group are described in Tables 2 to 5.


Table 2. aviation_housekeeping group in the NetCDF files

Data variable Units Description
platform_latitude_low_precision degree_north platform latitude low precision
platform_longitude_low_precision degree_east platform longitude low precision

Table 3. geolocation group in the NetCDF files

Data variable Units Description
azimuth degree azimuth angle
center_lat degree_north latitude of footprint center
center_lat_standard_error degree_north standard error of latitude of footprint center
center_lon degree_east longitude of footprint center
center_lon_standard_error degree_east standard error of longitude of footprint center
geolocation_qc N/A geolocation calculations status
ground_speed m s-1 ground speed
heading degree  heading
height meters height
height_bnds meters height of footprint vertex
height_standard_error meters standard error of height
lat_bnds degree_north latitude of footprint vertex
lon_bnds degree_east longitude of footprint vertex
measurement_time seconds seconds since 1980-01-06 0:0:0
pitch degree pitch
platform_geolocation_qc N/A platform geolocation status
platform_height meters instrument height
platform_height_standard_error meters uncertainty of platform height
platform_latitude degree_north platform latitude
platform_latitude_standard_error degree_north uncertainty of platform latitude
platform_longitude degree_east platform longitude
platform_longitude_standard_error degree_east uncertainty of platform longitude
roll degree roll
solar_azimuth degree solar azimuth angle
solar_zenith degree solar zenith angle
stokes_coefficients N/A stokes polarization coefficients
TAI93 N/A seconds since 1993-01-01 0:0:0
temperature_time seconds seconds since 1980-01-06 0:0:0
time seconds seconds since 1980-01-06 0:0:0
zenith degree zenith angle

Table 4. measurement_ancillary_info group in the NetCDF files

Data variable Units Description
beamsplitter_temperature degrees_celsius beamsplitter temperature
delta_opd_abo2 cm-1 delta opd abo2
delta_opd_sco2 cm-1 delta opd sco2
delta_opd_wco2 cm-1 delta opd wco2
detector_enclosure_temperature degrees_celsius detector enclosure temperature
detector_saturation_abo2 N/A detector saturation abo2
detector_saturation_sco2 N/A detector saturation sco2
detector_saturation_wco2 N/A detector saturation wco2
detector_temp_abo2 degrees_celsius abo2 detector temperature
detector_temp_sco2 degrees_celsius sco2 detector temperature
detector_temp_wco2 degrees_celsius wco2 detector temperature
electronic_box_temperature degrees_celsius electronic box temperature
instrument_mode * N/A instrument mode during data acquisition
interferometer_if_temperature degrees_celsius interferometer if temperature
internal_pressure pascals internal pressure
laser_temperature degrees_celsius laser temperature
maximum_opd_abo2 cm-1 maximum optical path difference abo2
maximum_opd_sco2 cm-1 maximum optical path difference sco2
maximum_opd_wco2 cm-1 maximum optical path difference wco2
minimum_opd_abo2 cm-1 minimum optical path difference abo2
minimum_opd_sco2 cm-1 minimum optical path difference sco2
minimum_opd_wco2 cm-1 minimum optical path difference wco2
number_of_interferogram_points_abo2 N/A number of interferogram points abo2
number_of_interferogram_points_sco2 N/A number of interferogram points sco2
number_of_interferogram_points_wco2 N/A number of interferogram points wco2
outside_air_temperature kelvins outside air temperature
phase_correction_abo2 N/A phase correction abo2
phase_correction_sco2 N/A phase correction sco2
phase_correction_wco2 N/A phase correction wco2
phase_residual_abo2 N/A phase residual abo2
phase_residual_sco2 N/A phase residual sco2
phase_residual_wco2 N/A phase residual wco2
preamp_adc_enclosure_temperature degrees_celsius preamp adc enclosure temperature
spectral_sampling_abo2 cm-1 spectral sampling abo2
spectral_sampling_sco2 cm-1 spectral sampling sco2
spectral_sampling_wco2 cm-1 spectral sampling wco2
start_wavenumber_abo2 cm-1 start wavenumber abo2
start_wavenumber_sco2 cm-1 start wavenumber sco2
start_wavenumber_wco2 cm-1 start wavenumber wco2
sweep_direction ** N/A sweep direction
zero_opd_abo2 cm-1 zero optical path difference abo2
zero_opd_sco2 cm-1 zero optical path difference sco2
zero_opd_wco2 cm-1 zero optical path difference wco2

* instrument_mode: 0 --- Off; 1 --- Science; 2 --- Calibration; 3 --- Unknown

** sweep_direction: 0 --- Forward; 1 --- Reverse; 2 --- Both

Table 5. science_measurement group in the NetCDF files

Data variable Units Description
spectral_radiance_imaginary_abo2 N/A upwelling spectral radiance in air abo2 band status
spectral_radiance_imaginary_sco2 N/A upwelling spectral radiance in air sco2 band status
spectral_radiance_imaginary_wco2 N/A upwelling spectral radiance in air wco2 band status
spectral_radiance_real_abo2 W cm-2 cm-1 sr-1 upwelling spectral radiance in air abo2 band real part
spectral_radiance_real_sco2 W cm-2 cm-1 sr-1 upwelling spectral radiance in air sco2 band real part
spectral_radiance_real_wco2 W cm-2 cm-1 sr-1 upwelling spectral radiance in air wco2 band real part
spectral_radiance_abo2_qc W cm-2 cm-1 sr-1 upwelling spectral radiance in air abo2 band imaginary part
spectral_radiance_sco2_qc W cm-2 cm-1 sr-1 upwelling spectral radiance in air sco2 band imaginary part
spectral_radiance_wco2_qc W cm-2 cm-1 sr-1 upwelling spectral radiance in air wco2 band imaginary part

代码

!pip install leafmap
!pip install pandas
!pip install folium
!pip install matplotlib
!pip install mapclassify
 
import pandas as pd
import leafmap
 
url = "https://github.com/opengeos/NASA-Earth-Data"
df = pd.read_csv(url, sep="\t")
df
 
leafmap.nasa_data_login()
results, gdf = leafmap.nasa_data_search(
    short_name="CARVE_L1_FTS_Spectra_1426",
    cloud_hosted=True,
    bounding_box=(-168.11, 58.84, -131.75, 71.43),
    temporal=("2012-05-23", "2015-11-13"),
    count=-1,  # use -1 to return all datasets
    return_gdf=True,
)
gdf.explore()
 
#leafmap.nasa_data_download(results[:5], out_dir="data")

引用

Kurosu, T.P., C.E. Miller, S.J. Dinardo, and CARVE Science Team . 2017. CARVE: L1 Spectral Radiances from Airborne FTS, Alaska, 2012-2015. ORNL DAAC, Oak Ridge, Tennessee, USA. 

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