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Madden-Julian Oscillation (MJO) - How to interpret the index?

How can I downscale daily values of relative humidity?Does the Sun's oscillation affect Earth's climate?How does one interpret negative geopotential height values?Are there datasets like the global land-ocean temperature index for land surface temperature only?How are daily precipitation totals computed?How to get single value of NDVI value from four different directions?CMIP5 multi-model ensemble, can it be shown as ensemble average?How to classify the ENSO phase of a year?How do the Madden Julian Oscillation (MJO) waves originate?Method to determine Tmax 95th percentile in a climate data

6

$begingroup$

How the Madden-Julian Oscillation (MJO) index can be interpret?

Let's suppose I have got an MJO index value of 0.6 in a given day, what this does mean?

Does 0.6 represents a weak MJO?

Data from https://www.esrl.noaa.gov/psd/mjo/mjoindex/
Thanks

meteorology climate

share|improve this question

edited 11 hours ago

gansub

3,63011845

asked 11 hours ago

aaaaaaaaaa

25016

$endgroup$

add a comment | 

6

$begingroup$

How the Madden-Julian Oscillation (MJO) index can be interpret?

Let's suppose I have got an MJO index value of 0.6 in a given day, what this does mean?

Does 0.6 represents a weak MJO?

Data from https://www.esrl.noaa.gov/psd/mjo/mjoindex/
Thanks

meteorology climate

share|improve this question

edited 11 hours ago

gansub

3,63011845

asked 11 hours ago

aaaaaaaaaa

25016

$endgroup$

add a comment | 

$begingroup$

How the Madden-Julian Oscillation (MJO) index can be interpret?

Let's suppose I have got an MJO index value of 0.6 in a given day, what this does mean?

Does 0.6 represents a weak MJO?

Data from https://www.esrl.noaa.gov/psd/mjo/mjoindex/
Thanks

meteorology climate

share|improve this question

edited 11 hours ago

gansub

3,63011845

asked 11 hours ago

aaaaaaaaaa

25016

$endgroup$

share|improve this question

edited 11 hours ago

gansub

3,63011845

asked 11 hours ago

aaaaaaaaaa

25016

share|improve this question

edited 11 hours ago

gansub

3,63011845

asked 11 hours ago

aaaaaaaaaa

25016

edited 11 hours ago

gansub

3,63011845

edited 11 hours ago

gansub

3,63011845

asked 11 hours ago

aaaaaaaaaa

25016

asked 11 hours ago

aaaaaaaaaa

25016

1 Answer
1

active

oldest

votes

6

$begingroup$

I prefer to use the BOM MJO index and the explanation provided over there -

When the index is within the centre circle the MJO is considered weak, meaning it is difficult to discern using the RMM methods. Outside of this circle the index is stronger and will usually move in an anti-clockwise direction as the MJO moves from west to east. For convenience, we define 8 different MJO phases in this diagram.

So in your case your signal value is 0.6 and that means it is fairly weak in amplitude as it is inside the circle. You also need to mention the phase of the MJO phase diagram. There are eight phases

Phase 1 & 8 - Western Hemisphere And Africa

Phase 2 & 3 - Indian Ocean

Phase 4 & 5 - Maritime Continent

Phase 6 & 7 - Western Pacific.

Currently the signal is a weak one as seen in this phase diagram MJO Phase diagram

When the MJO signal is strong it's amplitude will be greater than 1 and the contour line will be outside the circle. It should be noted that the MJO is an empircal index consisting of the 850 hPa winds, OLR and 200 hPa winds.

MJO passage through phase 6 and 7 is always of global interest as the impact can be of planetary scale. Usually El Ninos are preceded by Westerly Wind Bursts and the forcing factor can be a MJO passage through phase 6 and 7.

One can look at the raw data of the signal here - RMM Index text. This provides the amplitude of the signal as well as the phase of the MJO.

Another version of the same can be seen here - MJO RMM index

share|improve this answer

edited 9 hours ago

answered 11 hours ago

gansubgansub

3,63011845

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  thank you. what if I will need the MJO monthly averages? can I just average the daily MJO amplitude within each month? and how can I assign an average value to the monthly phase?
  $endgroup$
  – aaaaa
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @aaaaa A climatological value of the MJO index only has meaning by counting the number of days it takes to come back to the same point. So monthly values may not be of significance. Because the number of days it takes to return to the same point varies you can track that rather than monthly averages. Take a look at this paper - journals.ametsoc.org/doi/pdf/10.1175/JCLI-D-14-00744.1
  $endgroup$
  – gansub
  10 hours ago
  

  
  
  
  

add a comment | 

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6

$begingroup$

I prefer to use the BOM MJO index and the explanation provided over there -

When the index is within the centre circle the MJO is considered weak, meaning it is difficult to discern using the RMM methods. Outside of this circle the index is stronger and will usually move in an anti-clockwise direction as the MJO moves from west to east. For convenience, we define 8 different MJO phases in this diagram.

So in your case your signal value is 0.6 and that means it is fairly weak in amplitude as it is inside the circle. You also need to mention the phase of the MJO phase diagram. There are eight phases

Phase 1 & 8 - Western Hemisphere And Africa

Phase 2 & 3 - Indian Ocean

Phase 4 & 5 - Maritime Continent

Phase 6 & 7 - Western Pacific.

Currently the signal is a weak one as seen in this phase diagram MJO Phase diagram

When the MJO signal is strong it's amplitude will be greater than 1 and the contour line will be outside the circle. It should be noted that the MJO is an empircal index consisting of the 850 hPa winds, OLR and 200 hPa winds.

MJO passage through phase 6 and 7 is always of global interest as the impact can be of planetary scale. Usually El Ninos are preceded by Westerly Wind Bursts and the forcing factor can be a MJO passage through phase 6 and 7.

One can look at the raw data of the signal here - RMM Index text. This provides the amplitude of the signal as well as the phase of the MJO.

Another version of the same can be seen here - MJO RMM index

share|improve this answer

edited 9 hours ago

answered 11 hours ago

gansubgansub

3,63011845

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  thank you. what if I will need the MJO monthly averages? can I just average the daily MJO amplitude within each month? and how can I assign an average value to the monthly phase?
  $endgroup$
  – aaaaa
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @aaaaa A climatological value of the MJO index only has meaning by counting the number of days it takes to come back to the same point. So monthly values may not be of significance. Because the number of days it takes to return to the same point varies you can track that rather than monthly averages. Take a look at this paper - journals.ametsoc.org/doi/pdf/10.1175/JCLI-D-14-00744.1
  $endgroup$
  – gansub
  10 hours ago
  

  
  
  
  

add a comment | 

6

$begingroup$

I prefer to use the BOM MJO index and the explanation provided over there -

When the index is within the centre circle the MJO is considered weak, meaning it is difficult to discern using the RMM methods. Outside of this circle the index is stronger and will usually move in an anti-clockwise direction as the MJO moves from west to east. For convenience, we define 8 different MJO phases in this diagram.

So in your case your signal value is 0.6 and that means it is fairly weak in amplitude as it is inside the circle. You also need to mention the phase of the MJO phase diagram. There are eight phases

Phase 1 & 8 - Western Hemisphere And Africa

Phase 2 & 3 - Indian Ocean

Phase 4 & 5 - Maritime Continent

Phase 6 & 7 - Western Pacific.

Currently the signal is a weak one as seen in this phase diagram MJO Phase diagram

When the MJO signal is strong it's amplitude will be greater than 1 and the contour line will be outside the circle. It should be noted that the MJO is an empircal index consisting of the 850 hPa winds, OLR and 200 hPa winds.

MJO passage through phase 6 and 7 is always of global interest as the impact can be of planetary scale. Usually El Ninos are preceded by Westerly Wind Bursts and the forcing factor can be a MJO passage through phase 6 and 7.

One can look at the raw data of the signal here - RMM Index text. This provides the amplitude of the signal as well as the phase of the MJO.

Another version of the same can be seen here - MJO RMM index

share|improve this answer

edited 9 hours ago

answered 11 hours ago

gansubgansub

3,63011845

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  thank you. what if I will need the MJO monthly averages? can I just average the daily MJO amplitude within each month? and how can I assign an average value to the monthly phase?
  $endgroup$
  – aaaaa
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @aaaaa A climatological value of the MJO index only has meaning by counting the number of days it takes to come back to the same point. So monthly values may not be of significance. Because the number of days it takes to return to the same point varies you can track that rather than monthly averages. Take a look at this paper - journals.ametsoc.org/doi/pdf/10.1175/JCLI-D-14-00744.1
  $endgroup$
  – gansub
  10 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

I prefer to use the BOM MJO index and the explanation provided over there -

When the index is within the centre circle the MJO is considered weak, meaning it is difficult to discern using the RMM methods. Outside of this circle the index is stronger and will usually move in an anti-clockwise direction as the MJO moves from west to east. For convenience, we define 8 different MJO phases in this diagram.

So in your case your signal value is 0.6 and that means it is fairly weak in amplitude as it is inside the circle. You also need to mention the phase of the MJO phase diagram. There are eight phases

Phase 1 & 8 - Western Hemisphere And Africa

Phase 2 & 3 - Indian Ocean

Phase 4 & 5 - Maritime Continent

Phase 6 & 7 - Western Pacific.

Currently the signal is a weak one as seen in this phase diagram MJO Phase diagram

When the MJO signal is strong it's amplitude will be greater than 1 and the contour line will be outside the circle. It should be noted that the MJO is an empircal index consisting of the 850 hPa winds, OLR and 200 hPa winds.

MJO passage through phase 6 and 7 is always of global interest as the impact can be of planetary scale. Usually El Ninos are preceded by Westerly Wind Bursts and the forcing factor can be a MJO passage through phase 6 and 7.

One can look at the raw data of the signal here - RMM Index text. This provides the amplitude of the signal as well as the phase of the MJO.

Another version of the same can be seen here - MJO RMM index

share|improve this answer

edited 9 hours ago

answered 11 hours ago

gansubgansub

3,63011845

$endgroup$

share|improve this answer

edited 9 hours ago

answered 11 hours ago

gansubgansub

3,63011845

answered 11 hours ago

gansubgansub

3,63011845

answered 11 hours ago

gansubgansub

3,63011845