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Evaluation of corrective measures implemented for the preventive conservation of fresco paintings in Ariadne's house (Pompeii, Italy).

Merello P, García-Diego FJ, Zarzo M - Chem Cent J (2013)

Bottom Line: Data recorded in 2008 and 2010 were compared.As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings.In the room with four walls, the daily fluctuations also decreased about 4°C.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Applied Physics (UD Agriculture Engineering), Universitat Politècnica de València, Camino de Vera s/n, Valencia, 46022, Spain. fjgarcid@upvnet.upv.es.

ABSTRACT

Background: A microclimate monitoring study was conducted in 2008 aimed at assessing the conservation risks affecting the valuable wall paintings decorating Ariadne's House (Pompeii, Italy). It was found that thermohygrometric conditions were very unfavorable for the conservation of frescoes. As a result, it was decided to implement corrective measures, and the transparent polycarbonate sheets covering three rooms (one of them delimited by four walls and the others composed of three walls) were replaced by opaque roofs. In order to examine the effectiveness of this measure, the same monitoring system comprised by 26 thermohygrometric probes was installed again in summer 2010. Data recorded in 2008 and 2010 were compared.

Results: Microclimate conditions were also monitored in a control room with the same roof in both years. The average temperature in this room was lower in 2010, and it was decided to consider a time frame of 18 summer days with the same mean temperature in both years. In the rooms with three walls, the statistical analysis revealed that the diurnal maximum temperature decreased about 3.5°C due to the roof change, and the minimum temperature increased 0.5°C. As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings. In the room with four walls, the daily fluctuations also decreased about 4°C. Based on the results, other alternative actions are discussed aimed at improving the conservation conditions of wall paintings.

Conclusions: The roof change has reduced the most unfavorable thermohygrometric conditions affecting the mural paintings, but additional actions should be adopted for a long term preservation of Pompeian frescoes.

No MeSH data available.


Related in: MedlinePlus

Mean daily trajectories of temperature and RH in summer. Figures (a, b) depict temperature trajectories and (c, d) RH trajectories. Monitoring period: 14–31 August 2008 (dashed trajectories); 14–31 August 2010 (continuous). Trajectories were averaged for all data recorded in each room except by floor probes. Color codes: green (probes in room 1: #21 - #26); violet (room 2: #15, #17 - #20); blue (room 3: #7, #9, #10, #12); red (room 4: #3, #4); orange (floor probes: #6, #8, #11, #13, #14, #16). The probe inside the mosaic glass box (#5) was not considered here.
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Figure 3: Mean daily trajectories of temperature and RH in summer. Figures (a, b) depict temperature trajectories and (c, d) RH trajectories. Monitoring period: 14–31 August 2008 (dashed trajectories); 14–31 August 2010 (continuous). Trajectories were averaged for all data recorded in each room except by floor probes. Color codes: green (probes in room 1: #21 - #26); violet (room 2: #15, #17 - #20); blue (room 3: #7, #9, #10, #12); red (room 4: #3, #4); orange (floor probes: #6, #8, #11, #13, #14, #16). The probe inside the mosaic glass box (#5) was not considered here.

Mentions: Attempting to avoid this confusion of effects, it was decided to select a time frame of the monitoring period with a similar average temperature in both years inside room 4. The interval chosen was August 14th to 31st (18 days), as indicated in Figure 2. For probes in room 4, Figure 3a shows that the mean diurnal evolution of temperature in the 18-day period was nearly the same in 2008 and 2010. Moreover, the average RH was also similar in both years (Figure 3c). Thus, it was assumed that outside ambient conditions were similar in this time frame of both years. Data out of this interval were disregarded.


Evaluation of corrective measures implemented for the preventive conservation of fresco paintings in Ariadne's house (Pompeii, Italy).

Merello P, García-Diego FJ, Zarzo M - Chem Cent J (2013)

Mean daily trajectories of temperature and RH in summer. Figures (a, b) depict temperature trajectories and (c, d) RH trajectories. Monitoring period: 14–31 August 2008 (dashed trajectories); 14–31 August 2010 (continuous). Trajectories were averaged for all data recorded in each room except by floor probes. Color codes: green (probes in room 1: #21 - #26); violet (room 2: #15, #17 - #20); blue (room 3: #7, #9, #10, #12); red (room 4: #3, #4); orange (floor probes: #6, #8, #11, #13, #14, #16). The probe inside the mosaic glass box (#5) was not considered here.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3672094&req=5

Figure 3: Mean daily trajectories of temperature and RH in summer. Figures (a, b) depict temperature trajectories and (c, d) RH trajectories. Monitoring period: 14–31 August 2008 (dashed trajectories); 14–31 August 2010 (continuous). Trajectories were averaged for all data recorded in each room except by floor probes. Color codes: green (probes in room 1: #21 - #26); violet (room 2: #15, #17 - #20); blue (room 3: #7, #9, #10, #12); red (room 4: #3, #4); orange (floor probes: #6, #8, #11, #13, #14, #16). The probe inside the mosaic glass box (#5) was not considered here.
Mentions: Attempting to avoid this confusion of effects, it was decided to select a time frame of the monitoring period with a similar average temperature in both years inside room 4. The interval chosen was August 14th to 31st (18 days), as indicated in Figure 2. For probes in room 4, Figure 3a shows that the mean diurnal evolution of temperature in the 18-day period was nearly the same in 2008 and 2010. Moreover, the average RH was also similar in both years (Figure 3c). Thus, it was assumed that outside ambient conditions were similar in this time frame of both years. Data out of this interval were disregarded.

Bottom Line: Data recorded in 2008 and 2010 were compared.As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings.In the room with four walls, the daily fluctuations also decreased about 4°C.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Applied Physics (UD Agriculture Engineering), Universitat Politècnica de València, Camino de Vera s/n, Valencia, 46022, Spain. fjgarcid@upvnet.upv.es.

ABSTRACT

Background: A microclimate monitoring study was conducted in 2008 aimed at assessing the conservation risks affecting the valuable wall paintings decorating Ariadne's House (Pompeii, Italy). It was found that thermohygrometric conditions were very unfavorable for the conservation of frescoes. As a result, it was decided to implement corrective measures, and the transparent polycarbonate sheets covering three rooms (one of them delimited by four walls and the others composed of three walls) were replaced by opaque roofs. In order to examine the effectiveness of this measure, the same monitoring system comprised by 26 thermohygrometric probes was installed again in summer 2010. Data recorded in 2008 and 2010 were compared.

Results: Microclimate conditions were also monitored in a control room with the same roof in both years. The average temperature in this room was lower in 2010, and it was decided to consider a time frame of 18 summer days with the same mean temperature in both years. In the rooms with three walls, the statistical analysis revealed that the diurnal maximum temperature decreased about 3.5°C due to the roof change, and the minimum temperature increased 0.5°C. As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings. In the room with four walls, the daily fluctuations also decreased about 4°C. Based on the results, other alternative actions are discussed aimed at improving the conservation conditions of wall paintings.

Conclusions: The roof change has reduced the most unfavorable thermohygrometric conditions affecting the mural paintings, but additional actions should be adopted for a long term preservation of Pompeian frescoes.

No MeSH data available.


Related in: MedlinePlus