CARVE是一个由美国国家航空航天局（NASA）资助的项目，旨在研究北极地区的碳储

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发布于 2025-02-17 18:39:47

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CARVE: Fire-Related Aerosol and Soil Elemental and Isotopic Composition, Alaska, 2013

简介

CARVE（Carbon in Arctic Reservoirs Vulnerability Experiment）是一个由美国国家航空航天局（NASA）资助的项目，旨在研究北极地区的碳储量及其对气候变化的脆弱性。其中，CARVE项目围绕着火灾相关的气溶胶和土壤元素以及同位素组成展开研究。这些数据主要针对阿拉斯加地区的火灾相关气溶胶和土壤元素进行了采样和分析，时间跨度为2013年。

摘要

Spatial Coverage: Interior Alaska, USA

Spatial Resolution: Point locations

Temporal Coverage: 20130627 to 20130810

Temporal Resolution: Variable

Study Area: (Latitude and longitude given in decimal degrees)

Site (Region)	Westernmost Longitude	Easternmost Longitude	Northernmost Latitude	Southernmost Latitude
Interior Alaska, US	-168	-140	70.5	61.5

Table 1. Data files

File Name	Description
aerosol_C_N_composition.csv	Carbon and nitrogen composition and isotopic data from summer 2013 aerosol sampling
fire_derived_14C_endmember.csv	Isotopic analysis of total carbon in aerosols
BC_modeled_emissions.csv	Black carbon emissions modeled by combining the Alaska Fire Emissions Database with the coupled WRF-STILT model of Henderson et al (2015)
soil_core_C_N_composition.csv	Carbon and nitrogen composition and isotopic data from soil cores taken by Rogers et al. (2014)
soil_depth_integrated_C_N_composition.csv	Depth-integrated soil core composition and carbon loss due to fires

Table 2. Data fields in aerosol_C_N_composition.csv. Missing data are coded as -999.

Field name	Units	Description
Sampling begin date	yyyymmdd	Date aerosol sampling began
Sampling end date	yyyymmdd	Date aerosol sampling ended
Station		Aerosol sampling location
Sample description		Description of fire conditions during sample collection
Day of year	Day	Sampling period in day of year 2013
BC	Micrograms per cubic meter of air	Black carbon aerosols
BC_14C	Per mil	BC radiocarbon measurement raw data
BC_14C_fire	Per mil	BC radiocarbon measurement after background subtraction via isotope mass balance
TC	Micrograms per cubic meter of air	Total carbon aerosol
TC_14C	Per mil	TC radiocarbon measurement raw data
TC_14C_fire	Per mil	TC radiocarbon measurement after background subtraction via isotope mass balance
OC	Micrograms per cubic meter of air	Organic carbon aerosol
OC_14C	Per mil	OC radiocarbon measurement raw data
OC_14C_fire	Per mil	OC radiocarbon measurement after background subtraction via isotope mass balance
delta13C	Per mil	Stable carbon isotope
Nitrogen	Micrograms per cubic meter of air	Nitrogen content
delta15N	Per mil	Nitrogen stable isotope raw data
delta15N_fire	Per mil	Nitrogen stable isotope measurement after background subtraction via isotope mass balance. Background measurements are listed as ‘bkg’.
Carbon:Nitrogen	n/a	Total carbon to nitrogen ratio raw data
C:N_fire	n/a	Total carbon to nitrogen ratio after separately subtracting carbon background and nitrogen background and calculating new background corrected ratio. Background measurements are listed as ‘bkg’.

Table 3. Data fields in fire_derived_14C_endmember.csv. Missing data are coded to -999.

Field name	Units	Description
Method and Station	n/a	Method of background subtraction and sampling station.
BC_14C_fire	Per mil	Fire-derived 14C of BC. Average of all fire samples at corresponding station and for applied method
BC_fire_Stdev	Per mil	Standard deviation of all fire 14C BC samples at corresponding station and for applied method
TC_14C_fire	Per mil	Fire-derived 14C of TC. Average of all fire samples at corresponding station and for applied method
TC_fire_Stdev	Per mil	Standard deviation of all fire 14C TC samples at corresponding station and for applied method
OC_14C_fire	Per mil	Fire-derived 14C of OC. Average of all fire samples at corresponding station and for applied method
OC_fire_Stdev	Per mil	Standard deviation of all fire 14C OC samples at corresponding station and for applied method

*Note: The last row in fire_derived_14C_endmember.csv contains values averaged over both stations and both methods.

Table 4. Data fields in BC_modeled_emissions.csv. Missing data are coded to -999.

Field name	Units	Description
Day of Year	Fractional day	Fractional Julian day of 2013 at a 6-h time step
BC Caribou	Micrograms per cubic meter of air	Modeled BC concentrations at Caribou sampling station
BC Delta	Micrograms per cubic meter of air	Modeled BC concentrations at Delta sampling station

Table 5. Data fields in soil_core_C_N_composition.csv. Missing data are coded to -999.

Field name	Units	Description
Identifier	n/a	Soil core collection location identifier from Rogers et al., 2014
Core	n/a	Soil core description. A-F denotes different cores within each collection area from Rogers et al., 2014.
Soil_Horizon	n/a	Soil horizon description: LD - top live layer; F - fibric; M - mesic & humic; H - mineral soil with possibly some humic
Upper_depth	cm below surface	Upper depth of soil layer
Lower_depth	cm below surface	Lower depth of soil layer
Weight	g	Weight of soil horizon samples
Volume	cm3	Volume of soil horizon sample
Bulk_Density	g/cm3	Bulk density of soil horizon sample
pct_C	%	Percent carbon content of soil horizon sample
pct_N	%	Percent nitrogen content of soil horizon sample
C/N	n/a	Carbon to nitrogen ratio of soil horizon sample
mgC/g soil	mg/g	Calculated soil horizon carbon content per soil mass
mgN/g soil	mg/g	Calculated soil horizon nitrogen content per soil mass
mgC/cm3 soil	mg/cm3	Calculated soil horizon carbon content per soil volume
mgN/cm3 soil	mg/cm3	Calculated soil horizon nitrogen content per soil volume
d15N	Per mil	Nitrogen stable isotope content of soil horizon
13C	Per mil	Carbon stable isotope content of soil horizon, measured via gas bench
14C	Per mil	Radiocarbon content of soil horizon, measured by AMS
14C_err	Per mil	Radiocarbon measurement uncertainty, measured by AMS

Table 6. Data fields in soil_depth_integrated_C_N_composition.csv. Missing data are coded to -999.

Field name	Units	Description
Depth	cm	Soil depth, measured from top of soil. We used 0.5 cm intervals to integrate cumulative elemental and isotopic composition at depth. For depths >29 cm, values were calculated by assuming a linear relationship within the last few layers and propagating it to depth.
14C	Per mil	Cumulative radiocarbon content of soil integrated with depth
13C	Per mil	Cumulative stable carbon isotopic content of soil integrated with depth
15N	Per mil	Cumulative stable nitrogen isotopic content of soil integrated with depth
C_loss	Kg C/ m2	Carbon loss per m2 integrated with depth

*Note: At the bottom of the table, average values are provided for all black spruce land cover types (average of data from cores COO2, COO5, and COO6). A weighted average contribution from black spruce and white spruce/mixed aspen land cover types is also provided for each soil horizon. The weighting was 0.7 black spruce + 0.3 white spruce.

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/raw/main/nasa_earth_data.tsv"
df = pd.read_csv(url, sep="\t")
df
 
leafmap.nasa_data_login()
 
 
results, gdf = leafmap.nasa_data_search(
    short_name="BC_Aerosol_Dynamics_Alaska_1340",
    cloud_hosted=True,
    bounding_box=([-168.0, 61.5, -140.0, 70.5]),
    temporal=("2013-06-27", "2013-08-10"),
    count=-1,  # use -1 to return all datasets
    return_gdf=True,
)
 
 
gdf.explore()
 
#leafmap.nasa_data_download(results[:5], out_dir="data")

引用

Mouteva, G.O., C.I. Czimczik, S.M. Fahrni, E.B. Wiggins, B.M. Rogers, S. Veraverbeke, X. Xu, G.M. Santos, J. Henderson, C.E. Miller, and J.T. Randerson. 2016. CARVE: Fire-Related Aerosol and Soil Elemental and Isotopic Composition, Alaska, 2013. ORNL DAAC, Oak Ridge, Tennessee, USA. CARVE: Fire-Related Aerosol and Soil Elemental and Isotopic Composition, Alaska, 2013, https://doi.org/10.3334/ORNLDAAC/1340

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