Table 1 The cyclone-induced Chl-a blooms in the pre-monsoon seasons since 1997 in BoB.

From: Tropical storms trigger phytoplankton blooms in the deserts of north Indian Ocean

Sl. No

Name

Category

Bloom location

Before cyclone (mg/m3)

After cyclone (mg/m3)

1

BOB01 (2003)a

Normal

1

09°–10° N, 86°–87° E

05 May–09 May 0.14

20 May–24

May 1.89

2

BOB01 (2004)a

Normal

1

17.5°–18.5° N, 87.5°–88.5° E

09 May–13

May 0.31

20 May–24 May

3.26

3

Mala (2006)b

El Niño & PIOD

4

14°–15° N, 91°–92° E

19 Apr–23 Apr

0.17

30 Apr–4

May 1.8

4

Maarutha (2017)a

Normal

TS

16°–17° N, 90°–91° E

10 Apr–14 Apr

0.11

17 Apr–21 Apr

0.25

5

Mora (2017)c

Normal

1

16°–17° N, 91°–92° E

22 May–26

May 0.18

31 May–04 Jun 0.34

  1. The second column also provides information on the phase of remote forcing, such as the years with El Niño, La Niña, positive IOD (Indian Ocean Dipole), negative IOD and normal years without any activity. The cyclone category from 1 to 5 and tropical storms (TS) are also indicated in the third column. The Chl-a bloom (in mg/m3) estimated spatial grid (1° × 1° latitude-longitude area, 4th column), the Chl-a value before the cyclone period (5th column) and the Chl –a bloom after the passage (6th column) along with the dates are also noted.
  2. The signs with the names of the cyclones in the second column indicate the direction of cyclone movement and their landfall such as—
  3. aSouth east.
  4. bNorth east.
  5. cSouth west.
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