Table 1 List and grouping of abiotic factors.

From: A method to analyze the sensitivity ranking of various abiotic factors to acoustic densities of fishery resources in the surface mixed layer and bottom cold water layer of the coastal area of low latitude: a case study in the northern South China Sea

Group

Factor (abbreviation)

Factor (note)

Unit

Remark

Geographic factors

WD

Water depth

m

 

X

Longitude

°

 

Y

Latitude

°

 

Static factors

SS

Surface salinity

ppt

Surface

BS

Bottom salinity

ppt

Bottom

ST

Surface temperature

°C

Surface

BT

Bottom temperature

°C

Bottom

TRA

Transparency

m

Surface

CHL

Chlorophyll concentration

mg/m3

Surface

N2-0 m

NO2− 0 m concentration

mg/L

Surface

N2-10 m

NO2− 10 m concentration

mg/L

Surface

N2-20 m

NO2− 20 m concentration

mg/L

Bottom

N3-0 m

NO3− 0 m concentration

mg/L

Surface

N3-10 m

NO3− 10 m concentration

mg/L

Surface

N3-20 m

NO3− 20 m concentration

mg/L

Bottom

N4-0 m

NH4+ 0 m concentration

mg/L

Surface

N4-10 m

NH4+ 10 m concentration

mg/L

Surface

N4-20 m

NH4+ 20 m concentration

mg/L

Bottom

P-0 m

PO43− 0 m concentration

mg/L

Surface

P-10 m

PO43− 10 m concentration

mg/L

Surface

P-20 m

PO43− 20 m concentration

mg/L

Bottom

Si-0 m

SiO32− 0 m concentration

mg/L

Surface

Si-10 m

SiO32− 10 m concentration

mg/L

Surface

Si-20 m

SiO32− 20 m concentration

mg/L

Bottom

Dynamic factors

DS

Salinity difference between surface and bottom layers

ppt

 

DT

Temperature difference between surface and bottom layers

°C

 

N2-d010

Concentration difference between NO2− 0 m and 10 m

mg/L

 

N2-d020

Concentration difference between NO2− 0 m and 20 m

mg/L

 

N2-d1020

Concentration difference between NO2− 10 m and 20 m

mg/L

 

N3-d010

concentration difference between NO3− 0 m and 10 m

mg/L

 

N3-d020

Concentration difference between NO3− 0 m and 20 m

mg/L

 

N3-d1020

Concentration difference between NO3− 10 m and 20 m

mg/L

 

N4-d010

Concentration difference between NH4+ 0 m and 10 m

mg/L

 

N4-d020

Concentration difference between NH4+ 0 m and 20 m

mg/L

 

N4-d1020

Concentration difference between NH4+ 10 m and 20 m

mg/L

 

P-d010

Concentration difference between PO43− 0 m and 10 m

mg/L

 

P-d020

Concentration difference between PO43− 0 m and 20 m

mg/L

 

P-d1020

Concentration difference between PO43− 10 m and 20 m

mg/L

 

Si-d010

Concentration difference between SiO32− 0 m and 10 m

mg/L

 

Si-d020

Concentration difference between SiO32− 0 m and 20 m

mg/L

 

Si-d1020

Concentration difference between SiO32− 10 m and 20 m

mg/L

 
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