head_parts
head_parts Q&A head_parts Information related to DSS head_parts Information related to Particulate Matters head_parts For More Information(Japanese text only)
Q&A

→Return to the top of the Real-time DSS Information Page

DSS LIDAR

Q: When the sky is hazy, does that mean that DSS is occurring?
Q: Is today's DSS heavy or light?
Q: Is it true that some DSS may pass through the air over Japan?
Q: Is there any problem to hang my laundry out to dry tomorrow?
Q: Where did the DSS over Japan today originate from?


QWhen the sky is hazy, does that mean that DSS is occurring?

image

AEven when the sky is hazy it does not necessarily mean that DSS is occurring. The sky is sometimes hazy due to particulate matter originating from atmospheric pollution. Since LIDAR can distinguish between DSS and atmospheric pollutant particles, which is difficult to do visually, please refer to the information on this Real-time DSS Information website. The visibility near the ground may be poor sometimes due to sand and dust flying locally.

To 1. It is possible to distinguish DSS from atmospheric pollutant particles on the Features page

Return to top page↑


QIs the DSS today heavy or light?

image

AThe heights of the cylinders displayed on this Information page correspond to the amount of DSS floating near the ground (up to 1 km above ground). (Note: On cloudy days, the height represents the amount of DSS up to the height of the clouds.) As a result, by comparing the real-time screens with the past DSS events, it is possible to compare whether the current DSS is heavier or lighter than the past DSS. In Japan, DSS rarely exceeds 0.3 mg/m3 when converted to concentration, but if DSS exceeding 0.3 mg/m3 occurs near the ground, it may cause visible dirt on laundry and cars.

To 2. It is possible to determine in real-time the concentration of DSS near the ground on the Features page

For the amount of DSS near the ground, the concentration of suspended particulate matter (SPM) also serves as a reference. On the page for SPM data, i.e. "Soramamekun" (Japanese text only) , select the region that you want to view and the display item "Suspended Particulate Matter". When there is DSS event and the SPM concentration is higher than the range displayed in yellow, it can be determined that there is a heavy DSS.

To Other information related to DSS on the Features page

SPMimage

In addition, in this page, when the provisional data (hourly figure) for the SPM observation data at the ambient air pollution monitoring station closest to the LIDAR location exceeds 0.2 mg/m3 and, moreover, the DSS near the ground is heavy (exceeding 0.3 mg/m3) based on LIDAR, the character is displayed on the cylinder.

To 5. When the character is displayed on a cylinder on the Features page

Return to top page↑


QIs it true that some DSS may pass through the air over Japan?

AWhen you click on a cylinder on the map, an enlarged cylinder is displayed, and it is possible to see the area around which the DSS passed over as well as the extent of the DSS, up to 6 km above ground. When only the top part of the enlarged cylinder is red, the DSS is judged not to be occurring on the ground, but simply passing through the air.

To 3. It is possible to determine real-time DSS concentration by altitude on the Features Page

Return to top page↑


QIs it safe to hang my laundry out to dry tomorrow?

ASince the Japan Meteorological Agency forecasts DSS for the following day, please look at the Japan Meteorological Agency's announcement on their "Aeolian Dust Information page". On the CFORS page, which is provided by the National Institute for Environmental Studies and Kyushu University as part of their joint research using LIDAR data, simulation results for up to the day after next are available for reference.

Return to top page↑


QWhere did the DSS over Japan today originate from?

CFORSimage

ADSS originates from source areas such as the Takla Makan Desert, Gobi Desert, and Ocher Plateau in inland China to Japan through various transport processes. It is possible to retroactively view the paths of DSS from its source area to Japan in the past by using animated DSS distribution diagrams based on model calculations on the CFORS page. Please use the CFORS page as a reference.

Return to top page↑

bottom_parts