Kimura_SeaIceData

Description

The two files DATA_GRL_KIMURA2024_ICEX2020.csv and DATA_GRL_KIMURA2024_ICEX2022.csv contain data used in "Sea-Ice Deformations at the Submesoscale and Below during the Melting Season" by Satoshi Kimura. These data sets are taken as a part of Ice Exercise (ICEX) in 2020 and 2022 led by Arctic Submarine Laboratory.

Format

The data files contain 32 arrays in csv format, which are timeseries indicated by the first variable "tt". DATA_GRL_KIMURA2024_ICEX2020.csv contains the data from year 2020, and DATA_GRL_KIMURA2024_ICEX2022.csv is from year 2022. The data can be read using python for example

import pandas as pd

df = pd.read_csv('DATA_GRL_KIMURA2024_ICEX2020.csv')print(df.to_string()) 

Here, we describe the variable name and its descritpion.

### Time information

 tt:  Number of days since the epoch, (default: '1970-01-01T00:00:00')

year:

Year of the observation

month: Month of the observation

day: day

hour: hour

minute: minute

second: second

### Three devices (vertices ‘a’, ‘b’, and ‘c’) that form a triangle to compute deformation rates

 DeviceName_a: Name of the device at the vertex ‘a’

DeviceName_b: Name of the device at the vertex ‘b’

DeviceName_c: Name of the device at the vertex ‘c’

### Longitude and latitude are in decimal, and ‘-‘ in longitude indicates west

lon_a: Longitude of DeviceName_a

lat_a:  Latitude of DeviceName_a

lon_b: Longitude of DeviceName_b

lat_b: Latitude of DeviceName_b

lon_c: Longitude of DeviceName_c

lat_c: Latitude of DeviceName_c

### Properties of the triangle enclosed by the vertices ‘a’, ‘b’, and ‘c’

area: Area enclosed by the vertices ‘a’, ‘b’, and ‘c’ [m2]

u_a: Zonal velocity of DeviceName_a [m/s]

v_a: Meridional velocity of DeviceName_a [m/s]

u_b: Zonal velocity of DeviceName_b [m/s]

v_b: Meridional velocity of DeviceName_b [m/s]

u_c: Zonal velocity of DeviceName_c [m/s]

v_c: Meridional velocity of DeviceName_b [m/s]

### Velocity gradients inside the triangle, computed from equation (1)

ux: Zonal gradient of the zonal velocity [1/s]

uy: Meridional gradient of the zonal velocity [1/s]

vx: Zonal gradient of the meridional velocity [1/s]

vy: Meridional gradient of the zonal velocity [1/s]

### Invariants described in section 2.1

shr: Shear strain rate defined in equation (2)   [1/s]

div: Divergence rate defined in equation (2)  [1/s]

tot: Strain rate magnitude, tot^2 = shr^2 + div^2 [1/s]

theta: Relative contribution of shr and div, tan(theta) = shr/div, defined in equation (3)

### Time rate of changes in strain rates

alpha: Defined in equation (5)

shr_t: Time derivative of shr [1/s2]

div_t: Time derivative of div [1/s2]

theta_t: Time derivative of theta, tan(theta_t) = shr_t/div_t